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Finding the Fourth Proportional to 228.19, 314.88 and 128.61

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Solution

The fourth proportional to 228.19, 314.88 and 128.61 is: 177.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.19 : 314.88 = 128.61 : x
  2. Step 2: Convert to fraction form
    228.19/314.88 = 128.61/x
  3. Step 3: Cross multiply
    228.19x = 314.88 × 128.61
  4. Step 4: Simplify right side
    228.19x = 40,496.72
  5. Step 5: Solve for x
    x = 40,496.72/228.19
  6. Step 6: Final answer
    x = 177.47

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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.