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Finding the Fourth Proportional to 129,464.28, 178,676.28 and 72,886.32

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Solution

The fourth proportional to 129,464.28, 178,676.28 and 72,886.32 is: 100,591.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,464.28 : 178,676.28 = 72,886.32 : x
  2. Step 2: Convert to fraction form
    129,464.28/178,676.28 = 72,886.32/x
  3. Step 3: Cross multiply
    129,464.28x = 178,676.28 × 72,886.32
  4. Step 4: Simplify right side
    129,464.28x = 13,023,056,520.49
  5. Step 5: Solve for x
    x = 13,023,056,520.49/129,464.28
  6. Step 6: Final answer
    x = 100,591.89

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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.