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Finding the Fourth Proportional to 91,611.80, 126,427.92 and 51,325.90

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Solution

The fourth proportional to 91,611.80, 126,427.92 and 51,325.90 is: 70,831.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,611.80 : 126,427.92 = 51,325.90 : x
  2. Step 2: Convert to fraction form
    91,611.80/126,427.92 = 51,325.90/x
  3. Step 3: Cross multiply
    91,611.80x = 126,427.92 × 51,325.90
  4. Step 4: Simplify right side
    91,611.80x = 6,489,026,779.13
  5. Step 5: Solve for x
    x = 6,489,026,779.13/91,611.80
  6. Step 6: Final answer
    x = 70,831.78

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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.