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Finding the Fourth Proportional to 521,343.12, 781,521.62 and 393,060.39

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Solution

The fourth proportional to 521,343.12, 781,521.62 and 393,060.39 is: 589,218.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,343.12 : 781,521.62 = 393,060.39 : x
  2. Step 2: Convert to fraction form
    521,343.12/781,521.62 = 393,060.39/x
  3. Step 3: Cross multiply
    521,343.12x = 781,521.62 × 393,060.39
  4. Step 4: Simplify right side
    521,343.12x = 307,185,187,854.62
  5. Step 5: Solve for x
    x = 307,185,187,854.62/521,343.12
  6. Step 6: Final answer
    x = 589,218.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.