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Finding the Fourth Proportional to 642,117.52, 886,128.69 and 387,419.50

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Solution

The fourth proportional to 642,117.52, 886,128.69 and 387,419.50 is: 534,642.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,117.52 : 886,128.69 = 387,419.50 : x
  2. Step 2: Convert to fraction form
    642,117.52/886,128.69 = 387,419.50/x
  3. Step 3: Cross multiply
    642,117.52x = 886,128.69 × 387,419.50
  4. Step 4: Simplify right side
    642,117.52x = 343,303,534,015.46
  5. Step 5: Solve for x
    x = 343,303,534,015.46/642,117.52
  6. Step 6: Final answer
    x = 534,642.84

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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.