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Finding the Fourth Proportional to 129,376.96, 178,539.44 and 72,788.64

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Solution

The fourth proportional to 129,376.96, 178,539.44 and 72,788.64 is: 100,447.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,376.96 : 178,539.44 = 72,788.64 : x
  2. Step 2: Convert to fraction form
    129,376.96/178,539.44 = 72,788.64/x
  3. Step 3: Cross multiply
    129,376.96x = 178,539.44 × 72,788.64
  4. Step 4: Simplify right side
    129,376.96x = 12,995,643,023.96
  5. Step 5: Solve for x
    x = 12,995,643,023.96/129,376.96
  6. Step 6: Final answer
    x = 100,447.89

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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.