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Finding the Fourth Proportional to 119.40, 179.90 and 103.20

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Solution

The fourth proportional to 119.40, 179.90 and 103.20 is: 155.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.40 : 179.90 = 103.20 : x
  2. Step 2: Convert to fraction form
    119.40/179.90 = 103.20/x
  3. Step 3: Cross multiply
    119.40x = 179.90 × 103.20
  4. Step 4: Simplify right side
    119.40x = 18,565.16
  5. Step 5: Solve for x
    x = 18,565.16/119.40
  6. Step 6: Final answer
    x = 155.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.