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Finding the Fourth Proportional to 129,638.44, 178,832.74 and 89,282.28

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Solution

The fourth proportional to 129,638.44, 178,832.74 and 89,282.28 is: 123,162.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,638.44 : 178,832.74 = 89,282.28 : x
  2. Step 2: Convert to fraction form
    129,638.44/178,832.74 = 89,282.28/x
  3. Step 3: Cross multiply
    129,638.44x = 178,832.74 × 89,282.28
  4. Step 4: Simplify right side
    129,638.44x = 15,966,594,765.85
  5. Step 5: Solve for x
    x = 15,966,594,765.85/129,638.44
  6. Step 6: Final answer
    x = 123,162.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.