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Finding the Fourth Proportional to 129.52, 178.74 and 70.51

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Solution

The fourth proportional to 129.52, 178.74 and 70.51 is: 97.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.52 : 178.74 = 70.51 : x
  2. Step 2: Convert to fraction form
    129.52/178.74 = 70.51/x
  3. Step 3: Cross multiply
    129.52x = 178.74 × 70.51
  4. Step 4: Simplify right side
    129.52x = 12,601.71
  5. Step 5: Solve for x
    x = 12,601.71/129.52
  6. Step 6: Final answer
    x = 97.30

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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.