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Finding the Fourth Proportional to 718,456.57, 991,433.70 and 408,351.03

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Solution

The fourth proportional to 718,456.57, 991,433.70 and 408,351.03 is: 563,503.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,456.57 : 991,433.70 = 408,351.03 : x
  2. Step 2: Convert to fraction form
    718,456.57/991,433.70 = 408,351.03/x
  3. Step 3: Cross multiply
    718,456.57x = 991,433.70 × 408,351.03
  4. Step 4: Simplify right side
    718,456.57x = 404,852,977,491.07
  5. Step 5: Solve for x
    x = 404,852,977,491.07/718,456.57
  6. Step 6: Final answer
    x = 563,503.76

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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.