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Finding the Fourth Proportional to 90,696.80, 136,066.80 and 38,079.20

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Solution

The fourth proportional to 90,696.80, 136,066.80 and 38,079.20 is: 57,127.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,696.80 : 136,066.80 = 38,079.20 : x
  2. Step 2: Convert to fraction form
    90,696.80/136,066.80 = 38,079.20/x
  3. Step 3: Cross multiply
    90,696.80x = 136,066.80 × 38,079.20
  4. Step 4: Simplify right side
    90,696.80x = 5,181,314,890.56
  5. Step 5: Solve for x
    x = 5,181,314,890.56/90,696.80
  6. Step 6: Final answer
    x = 57,127.87

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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.