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Finding the Fourth Proportional to 154.18, 212.75 and 129.58

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Solution

The fourth proportional to 154.18, 212.75 and 129.58 is: 178.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.18 : 212.75 = 129.58 : x
  2. Step 2: Convert to fraction form
    154.18/212.75 = 129.58/x
  3. Step 3: Cross multiply
    154.18x = 212.75 × 129.58
  4. Step 4: Simplify right side
    154.18x = 27,568.15
  5. Step 5: Solve for x
    x = 27,568.15/154.18
  6. Step 6: Final answer
    x = 178.80

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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.