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Finding the Fourth Proportional to 154.38, 212.95 and 105.28

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Solution

The fourth proportional to 154.38, 212.95 and 105.28 is: 145.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.38 : 212.95 = 105.28 : x
  2. Step 2: Convert to fraction form
    154.38/212.95 = 105.28/x
  3. Step 3: Cross multiply
    154.38x = 212.95 × 105.28
  4. Step 4: Simplify right side
    154.38x = 22,419.38
  5. Step 5: Solve for x
    x = 22,419.38/154.38
  6. Step 6: Final answer
    x = 145.22

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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.