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Finding the Fourth Proportional to 129,408.76, 178,554.54 and 72,799.48

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Solution

The fourth proportional to 129,408.76, 178,554.54 and 72,799.48 is: 100,446.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,408.76 : 178,554.54 = 72,799.48 : x
  2. Step 2: Convert to fraction form
    129,408.76/178,554.54 = 72,799.48/x
  3. Step 3: Cross multiply
    129,408.76x = 178,554.54 × 72,799.48
  4. Step 4: Simplify right side
    129,408.76x = 12,998,677,663.64
  5. Step 5: Solve for x
    x = 12,998,677,663.64/129,408.76
  6. Step 6: Final answer
    x = 100,446.66

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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.