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Finding the Fourth Proportional to 228.81, 315.74 and 129.23

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Solution

The fourth proportional to 228.81, 315.74 and 129.23 is: 178.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.81 : 315.74 = 129.23 : x
  2. Step 2: Convert to fraction form
    228.81/315.74 = 129.23/x
  3. Step 3: Cross multiply
    228.81x = 315.74 × 129.23
  4. Step 4: Simplify right side
    228.81x = 40,801.50
  5. Step 5: Solve for x
    x = 40,801.50/228.81
  6. Step 6: Final answer
    x = 178.32

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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.