Home / 643,902.10-888,588.40-402,324.86

Finding the Fourth Proportional to 643,902.10, 888,588.40 and 402,324.86

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Solution

The fourth proportional to 643,902.10, 888,588.40 and 402,324.86 is: 555,210.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,902.10 : 888,588.40 = 402,324.86 : x
  2. Step 2: Convert to fraction form
    643,902.10/888,588.40 = 402,324.86/x
  3. Step 3: Cross multiply
    643,902.10x = 888,588.40 × 402,324.86
  4. Step 4: Simplify right side
    643,902.10x = 357,501,203,627.62
  5. Step 5: Solve for x
    x = 357,501,203,627.62/643,902.10
  6. Step 6: Final answer
    x = 555,210.49

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.