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Finding the Fourth Proportional to 91,159.20, 136,738.80 and 78,693.30

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Solution

The fourth proportional to 91,159.20, 136,738.80 and 78,693.30 is: 118,039.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,159.20 : 136,738.80 = 78,693.30 : x
  2. Step 2: Convert to fraction form
    91,159.20/136,738.80 = 78,693.30/x
  3. Step 3: Cross multiply
    91,159.20x = 136,738.80 × 78,693.30
  4. Step 4: Simplify right side
    91,159.20x = 10,760,427,410.04
  5. Step 5: Solve for x
    x = 10,760,427,410.04/91,159.20
  6. Step 6: Final answer
    x = 118,039.95

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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.