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Finding the Fourth Proportional to 228.74, 315.63 and 129.14

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Solution

The fourth proportional to 228.74, 315.63 and 129.14 is: 178.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.74 : 315.63 = 129.14 : x
  2. Step 2: Convert to fraction form
    228.74/315.63 = 129.14/x
  3. Step 3: Cross multiply
    228.74x = 315.63 × 129.14
  4. Step 4: Simplify right side
    228.74x = 40,760.55
  5. Step 5: Solve for x
    x = 40,760.55/228.74
  6. Step 6: Final answer
    x = 178.20

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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.