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Finding the Fourth Proportional to 139,461.12, 192,469.68 and 85,781.52

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Solution

The fourth proportional to 139,461.12, 192,469.68 and 85,781.52 is: 118,386.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,461.12 : 192,469.68 = 85,781.52 : x
  2. Step 2: Convert to fraction form
    139,461.12/192,469.68 = 85,781.52/x
  3. Step 3: Cross multiply
    139,461.12x = 192,469.68 × 85,781.52
  4. Step 4: Simplify right side
    139,461.12x = 16,510,341,704.31
  5. Step 5: Solve for x
    x = 16,510,341,704.31/139,461.12
  6. Step 6: Final answer
    x = 118,386.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.