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Finding the Fourth Proportional to 139,728.90, 209,593.35 and 133,605.30

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Solution

The fourth proportional to 139,728.90, 209,593.35 and 133,605.30 is: 200,407.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,728.90 : 209,593.35 = 133,605.30 : x
  2. Step 2: Convert to fraction form
    139,728.90/209,593.35 = 133,605.30/x
  3. Step 3: Cross multiply
    139,728.90x = 209,593.35 × 133,605.30
  4. Step 4: Simplify right side
    139,728.90x = 28,002,782,404.76
  5. Step 5: Solve for x
    x = 28,002,782,404.76/139,728.90
  6. Step 6: Final answer
    x = 200,407.95

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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.