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Finding the Fourth Proportional to 154.11, 212.20 and 129.51

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Solution

The fourth proportional to 154.11, 212.20 and 129.51 is: 178.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.11 : 212.20 = 129.51 : x
  2. Step 2: Convert to fraction form
    154.11/212.20 = 129.51/x
  3. Step 3: Cross multiply
    154.11x = 212.20 × 129.51
  4. Step 4: Simplify right side
    154.11x = 27,482.02
  5. Step 5: Solve for x
    x = 27,482.02/154.11
  6. Step 6: Final answer
    x = 178.33

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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.