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Finding the Fourth Proportional to 154.12, 212.70 and 88.62

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Solution

The fourth proportional to 154.12, 212.70 and 88.62 is: 122.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.12 : 212.70 = 88.62 : x
  2. Step 2: Convert to fraction form
    154.12/212.70 = 88.62/x
  3. Step 3: Cross multiply
    154.12x = 212.70 × 88.62
  4. Step 4: Simplify right side
    154.12x = 18,849.47
  5. Step 5: Solve for x
    x = 18,849.47/154.12
  6. Step 6: Final answer
    x = 122.30

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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.