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Finding the Fourth Proportional to 713,780.87, 985,053.75 and 391,521.02

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Solution

The fourth proportional to 713,780.87, 985,053.75 and 391,521.02 is: 540,318.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,780.87 : 985,053.75 = 391,521.02 : x
  2. Step 2: Convert to fraction form
    713,780.87/985,053.75 = 391,521.02/x
  3. Step 3: Cross multiply
    713,780.87x = 985,053.75 × 391,521.02
  4. Step 4: Simplify right side
    713,780.87x = 385,669,251,417.46
  5. Step 5: Solve for x
    x = 385,669,251,417.46/713,780.87
  6. Step 6: Final answer
    x = 540,318.84

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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.