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Finding the Fourth Proportional to 91,789,497.78, 137,597,686.80 and 45,687,779.87

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Solution

The fourth proportional to 91,789,497.78, 137,597,686.80 and 45,687,779.87 is: 68,488,585.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,789,497.78 : 137,597,686.80 = 45,687,779.87 : x
  2. Step 2: Convert to fraction form
    91,789,497.78/137,597,686.80 = 45,687,779.87/x
  3. Step 3: Cross multiply
    91,789,497.78x = 137,597,686.80 × 45,687,779.87
  4. Step 4: Simplify right side
    91,789,497.78x = 6,286,532,824,408,669
  5. Step 5: Solve for x
    x = 6,286,532,824,408,669/91,789,497.78
  6. Step 6: Final answer
    x = 68,488,585.04

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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.