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Finding the Fourth Proportional to 12,061.80, 18,092.70 and 7,128.90

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Solution

The fourth proportional to 12,061.80, 18,092.70 and 7,128.90 is: 10,693.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,061.80 : 18,092.70 = 7,128.90 : x
  2. Step 2: Convert to fraction form
    12,061.80/18,092.70 = 7,128.90/x
  3. Step 3: Cross multiply
    12,061.80x = 18,092.70 × 7,128.90
  4. Step 4: Simplify right side
    12,061.80x = 128,981,049.03
  5. Step 5: Solve for x
    x = 128,981,049.03/12,061.80
  6. Step 6: Final answer
    x = 10,693.35

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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.