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Finding the Fourth Proportional to 119.12, 178.59 and 61.23

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Solution

The fourth proportional to 119.12, 178.59 and 61.23 is: 91.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.12 : 178.59 = 61.23 : x
  2. Step 2: Convert to fraction form
    119.12/178.59 = 61.23/x
  3. Step 3: Cross multiply
    119.12x = 178.59 × 61.23
  4. Step 4: Simplify right side
    119.12x = 10,934.17
  5. Step 5: Solve for x
    x = 10,934.17/119.12
  6. Step 6: Final answer
    x = 91.80

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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.