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Finding the Fourth Proportional to 217.64, 300.38 and 129.10

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Solution

The fourth proportional to 217.64, 300.38 and 129.10 is: 178.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.64 : 300.38 = 129.10 : x
  2. Step 2: Convert to fraction form
    217.64/300.38 = 129.10/x
  3. Step 3: Cross multiply
    217.64x = 300.38 × 129.10
  4. Step 4: Simplify right side
    217.64x = 38,779.06
  5. Step 5: Solve for x
    x = 38,779.06/217.64
  6. Step 6: Final answer
    x = 178.18

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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.