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Finding the Fourth Proportional to 119.28, 178.85 and 38.10

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Solution

The fourth proportional to 119.28, 178.85 and 38.10 is: 57.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.28 : 178.85 = 38.10 : x
  2. Step 2: Convert to fraction form
    119.28/178.85 = 38.10/x
  3. Step 3: Cross multiply
    119.28x = 178.85 × 38.10
  4. Step 4: Simplify right side
    119.28x = 6,814.19
  5. Step 5: Solve for x
    x = 6,814.19/119.28
  6. Step 6: Final answer
    x = 57.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.