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Finding the Fourth Proportional to 91,373.40, 137,074.80 and 28,178.64

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Solution

The fourth proportional to 91,373.40, 137,074.80 and 28,178.64 is: 42,272.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,373.40 : 137,074.80 = 28,178.64 : x
  2. Step 2: Convert to fraction form
    91,373.40/137,074.80 = 28,178.64/x
  3. Step 3: Cross multiply
    91,373.40x = 137,074.80 × 28,178.64
  4. Step 4: Simplify right side
    91,373.40x = 3,862,581,442.27
  5. Step 5: Solve for x
    x = 3,862,581,442.27/91,373.40
  6. Step 6: Final answer
    x = 42,272.49

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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.