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Finding the Fourth Proportional to 18,487.80, 27,712.80 and 9,113.40

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Solution

The fourth proportional to 18,487.80, 27,712.80 and 9,113.40 is: 13,660.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,487.80 : 27,712.80 = 9,113.40 : x
  2. Step 2: Convert to fraction form
    18,487.80/27,712.80 = 9,113.40/x
  3. Step 3: Cross multiply
    18,487.80x = 27,712.80 × 9,113.40
  4. Step 4: Simplify right side
    18,487.80x = 252,557,831.52
  5. Step 5: Solve for x
    x = 252,557,831.52/18,487.80
  6. Step 6: Final answer
    x = 13,660.78

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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.