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Finding the Fourth Proportional to 643,813.72, 888,456.22 and 357,336.28

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Solution

The fourth proportional to 643,813.72, 888,456.22 and 357,336.28 is: 493,120.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,813.72 : 888,456.22 = 357,336.28 : x
  2. Step 2: Convert to fraction form
    643,813.72/888,456.22 = 357,336.28/x
  3. Step 3: Cross multiply
    643,813.72x = 888,456.22 × 357,336.28
  4. Step 4: Simplify right side
    643,813.72x = 317,477,640,597.66
  5. Step 5: Solve for x
    x = 317,477,640,597.66/643,813.72
  6. Step 6: Final answer
    x = 493,120.34

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Double scale
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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.