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Finding the Fourth Proportional to 128,613.68, 192,909.40 and 39,865.20

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Solution

The fourth proportional to 128,613.68, 192,909.40 and 39,865.20 is: 59,794.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,613.68 : 192,909.40 = 39,865.20 : x
  2. Step 2: Convert to fraction form
    128,613.68/192,909.40 = 39,865.20/x
  3. Step 3: Cross multiply
    128,613.68x = 192,909.40 × 39,865.20
  4. Step 4: Simplify right side
    128,613.68x = 7,690,371,812.88
  5. Step 5: Solve for x
    x = 7,690,371,812.88/128,613.68
  6. Step 6: Final answer
    x = 59,794.35

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1.5x scale

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.