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Finding the Fourth Proportional to 28,474.64, 42,687.65 and 20,128.40

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Solution

The fourth proportional to 28,474.64, 42,687.65 and 20,128.40 is: 30,175.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,474.64 : 42,687.65 = 20,128.40 : x
  2. Step 2: Convert to fraction form
    28,474.64/42,687.65 = 20,128.40/x
  3. Step 3: Cross multiply
    28,474.64x = 42,687.65 × 20,128.40
  4. Step 4: Simplify right side
    28,474.64x = 859,233,780.18
  5. Step 5: Solve for x
    x = 859,233,780.18/28,474.64
  6. Step 6: Final answer
    x = 30,175.41

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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.