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Finding the Fourth Proportional to 119.16, 178.47 and 84.78

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Solution

The fourth proportional to 119.16, 178.47 and 84.78 is: 126.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.16 : 178.47 = 84.78 : x
  2. Step 2: Convert to fraction form
    119.16/178.47 = 84.78/x
  3. Step 3: Cross multiply
    119.16x = 178.47 × 84.78
  4. Step 4: Simplify right side
    119.16x = 15,130.69
  5. Step 5: Solve for x
    x = 15,130.69/119.16
  6. Step 6: Final answer
    x = 126.98

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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.