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Finding the Fourth Proportional to 92,979.20, 139,468.80 and 89,350.40

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Solution

The fourth proportional to 92,979.20, 139,468.80 and 89,350.40 is: 134,025.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,979.20 : 139,468.80 = 89,350.40 : x
  2. Step 2: Convert to fraction form
    92,979.20/139,468.80 = 89,350.40/x
  3. Step 3: Cross multiply
    92,979.20x = 139,468.80 × 89,350.40
  4. Step 4: Simplify right side
    92,979.20x = 12,461,593,067.52
  5. Step 5: Solve for x
    x = 12,461,593,067.52/92,979.20
  6. Step 6: Final answer
    x = 134,025.60

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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.