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Finding the Fourth Proportional to 28,381.42, 42,572.13 and 8,660.08

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Solution

The fourth proportional to 28,381.42, 42,572.13 and 8,660.08 is: 12,990.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,381.42 : 42,572.13 = 8,660.08 : x
  2. Step 2: Convert to fraction form
    28,381.42/42,572.13 = 8,660.08/x
  3. Step 3: Cross multiply
    28,381.42x = 42,572.13 × 8,660.08
  4. Step 4: Simplify right side
    28,381.42x = 368,678,051.57
  5. Step 5: Solve for x
    x = 368,678,051.57/28,381.42
  6. Step 6: Final answer
    x = 12,990.12

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Similar ratio
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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.