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Finding the Fourth Proportional to 91,415.20, 137,122.80 and 75,863.20

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Solution

The fourth proportional to 91,415.20, 137,122.80 and 75,863.20 is: 113,794.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,415.20 : 137,122.80 = 75,863.20 : x
  2. Step 2: Convert to fraction form
    91,415.20/137,122.80 = 75,863.20/x
  3. Step 3: Cross multiply
    91,415.20x = 137,122.80 × 75,863.20
  4. Step 4: Simplify right side
    91,415.20x = 10,402,574,400.96
  5. Step 5: Solve for x
    x = 10,402,574,400.96/91,415.20
  6. Step 6: Final answer
    x = 113,794.80

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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.