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Finding the Fourth Proportional to 129.05, 178.08 and 70.83

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Solution

The fourth proportional to 129.05, 178.08 and 70.83 is: 97.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.05 : 178.08 = 70.83 : x
  2. Step 2: Convert to fraction form
    129.05/178.08 = 70.83/x
  3. Step 3: Cross multiply
    129.05x = 178.08 × 70.83
  4. Step 4: Simplify right side
    129.05x = 12,613.67
  5. Step 5: Solve for x
    x = 12,613.67/129.05
  6. Step 6: Final answer
    x = 97.74

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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.