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Finding the Fourth Proportional to 91,245.60, 136,809.20 and 38,640.80

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Solution

The fourth proportional to 91,245.60, 136,809.20 and 38,640.80 is: 57,936.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,245.60 : 136,809.20 = 38,640.80 : x
  2. Step 2: Convert to fraction form
    91,245.60/136,809.20 = 38,640.80/x
  3. Step 3: Cross multiply
    91,245.60x = 136,809.20 × 38,640.80
  4. Step 4: Simplify right side
    91,245.60x = 5,286,416,935.36
  5. Step 5: Solve for x
    x = 5,286,416,935.36/91,245.60
  6. Step 6: Final answer
    x = 57,936.13

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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.