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Finding the Fourth Proportional to 643,565.48, 888,120.51 and 357,087.61

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Solution

The fourth proportional to 643,565.48, 888,120.51 and 357,087.61 is: 492,780.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,565.48 : 888,120.51 = 357,087.61 : x
  2. Step 2: Convert to fraction form
    643,565.48/888,120.51 = 357,087.61/x
  3. Step 3: Cross multiply
    643,565.48x = 888,120.51 × 357,087.61
  4. Step 4: Simplify right side
    643,565.48x = 317,136,825,867.28
  5. Step 5: Solve for x
    x = 317,136,825,867.28/643,565.48
  6. Step 6: Final answer
    x = 492,780.98

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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.