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Finding the Fourth Proportional to 643,766.87, 888,356.90 and 357,287.15

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Solution

The fourth proportional to 643,766.87, 888,356.90 and 357,287.15 is: 493,033.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,766.87 : 888,356.90 = 357,287.15 : x
  2. Step 2: Convert to fraction form
    643,766.87/888,356.90 = 357,287.15/x
  3. Step 3: Cross multiply
    643,766.87x = 888,356.90 × 357,287.15
  4. Step 4: Simplify right side
    643,766.87x = 317,398,503,197.40
  5. Step 5: Solve for x
    x = 317,398,503,197.40/643,766.87
  6. Step 6: Final answer
    x = 493,033.30

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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.