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Finding the Fourth Proportional to 718,755,688.47, 991,928,211.53 and 405,375,559.59

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Solution

The fourth proportional to 718,755,688.47, 991,928,211.53 and 405,375,559.59 is: 559,443,855.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,755,688.47 : 991,928,211.53 = 405,375,559.59 : x
  2. Step 2: Convert to fraction form
    718,755,688.47/991,928,211.53 = 405,375,559.59/x
  3. Step 3: Cross multiply
    718,755,688.47x = 991,928,211.53 × 405,375,559.59
  4. Step 4: Simplify right side
    718,755,688.47x = 402,103,453,819,333,056
  5. Step 5: Solve for x
    x = 402,103,453,819,333,056/718,755,688.47
  6. Step 6: Final answer
    x = 559,443,855.92

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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.