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Finding the Fourth Proportional to 515,098.90, 711,020.55 and 351,638.47

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Solution

The fourth proportional to 515,098.90, 711,020.55 and 351,638.47 is: 485,386.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,098.90 : 711,020.55 = 351,638.47 : x
  2. Step 2: Convert to fraction form
    515,098.90/711,020.55 = 351,638.47/x
  3. Step 3: Cross multiply
    515,098.90x = 711,020.55 × 351,638.47
  4. Step 4: Simplify right side
    515,098.90x = 250,022,178,340.56
  5. Step 5: Solve for x
    x = 250,022,178,340.56/515,098.90
  6. Step 6: Final answer
    x = 485,386.74

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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.