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Finding the Fourth Proportional to 91,373.60, 136,932.40 and 72,685.60

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Solution

The fourth proportional to 91,373.60, 136,932.40 and 72,685.60 is: 108,926.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,373.60 : 136,932.40 = 72,685.60 : x
  2. Step 2: Convert to fraction form
    91,373.60/136,932.40 = 72,685.60/x
  3. Step 3: Cross multiply
    91,373.60x = 136,932.40 × 72,685.60
  4. Step 4: Simplify right side
    91,373.60x = 9,953,013,653.44
  5. Step 5: Solve for x
    x = 9,953,013,653.44/91,373.60
  6. Step 6: Final answer
    x = 108,926.58

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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.