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Finding the Fourth Proportional to 119.61, 179.28 and 64.80

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Solution

The fourth proportional to 119.61, 179.28 and 64.80 is: 97.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.61 : 179.28 = 64.80 : x
  2. Step 2: Convert to fraction form
    119.61/179.28 = 64.80/x
  3. Step 3: Cross multiply
    119.61x = 179.28 × 64.80
  4. Step 4: Simplify right side
    119.61x = 11,617.34
  5. Step 5: Solve for x
    x = 11,617.34/119.61
  6. Step 6: Final answer
    x = 97.13

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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.