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Finding the Fourth Proportional to 91,325.60, 136,988.40 and 76,891.40

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Solution

The fourth proportional to 91,325.60, 136,988.40 and 76,891.40 is: 115,337.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,325.60 : 136,988.40 = 76,891.40 : x
  2. Step 2: Convert to fraction form
    91,325.60/136,988.40 = 76,891.40/x
  3. Step 3: Cross multiply
    91,325.60x = 136,988.40 × 76,891.40
  4. Step 4: Simplify right side
    91,325.60x = 10,533,229,859.76
  5. Step 5: Solve for x
    x = 10,533,229,859.76/91,325.60
  6. Step 6: Final answer
    x = 115,337.10

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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.