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Finding the Fourth Proportional to 138,660,978.57, 191,349,811.85 and 76,779,988.53

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Solution

The fourth proportional to 138,660,978.57, 191,349,811.85 and 76,779,988.53 is: 105,955,089.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,660,978.57 : 191,349,811.85 = 76,779,988.53 : x
  2. Step 2: Convert to fraction form
    138,660,978.57/191,349,811.85 = 76,779,988.53/x
  3. Step 3: Cross multiply
    138,660,978.57x = 191,349,811.85 × 76,779,988.53
  4. Step 4: Simplify right side
    138,660,978.57x = 14,691,836,358,103,910
  5. Step 5: Solve for x
    x = 14,691,836,358,103,910/138,660,978.57
  6. Step 6: Final answer
    x = 105,955,089.24

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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.