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Finding the Fourth Proportional to 643,972.86, 888,637.98 and 357,470.31

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Solution

The fourth proportional to 643,972.86, 888,637.98 and 357,470.31 is: 493,284.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,972.86 : 888,637.98 = 357,470.31 : x
  2. Step 2: Convert to fraction form
    643,972.86/888,637.98 = 357,470.31/x
  3. Step 3: Cross multiply
    643,972.86x = 888,637.98 × 357,470.31
  4. Step 4: Simplify right side
    643,972.86x = 317,661,694,188.37
  5. Step 5: Solve for x
    x = 317,661,694,188.37/643,972.86
  6. Step 6: Final answer
    x = 493,284.29

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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.