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Finding the Fourth Proportional to 228.66, 315.56 and 129.08

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Solution

The fourth proportional to 228.66, 315.56 and 129.08 is: 178.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.66 : 315.56 = 129.08 : x
  2. Step 2: Convert to fraction form
    228.66/315.56 = 129.08/x
  3. Step 3: Cross multiply
    228.66x = 315.56 × 129.08
  4. Step 4: Simplify right side
    228.66x = 40,730.26
  5. Step 5: Solve for x
    x = 40,730.26/228.66
  6. Step 6: Final answer
    x = 178.13

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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.