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Finding the Fourth Proportional to 216.39, 298.62 and 129.12

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Solution

The fourth proportional to 216.39, 298.62 and 129.12 is: 178.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.39 : 298.62 = 129.12 : x
  2. Step 2: Convert to fraction form
    216.39/298.62 = 129.12/x
  3. Step 3: Cross multiply
    216.39x = 298.62 × 129.12
  4. Step 4: Simplify right side
    216.39x = 38,557.81
  5. Step 5: Solve for x
    x = 38,557.81/216.39
  6. Step 6: Final answer
    x = 178.19

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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.