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Finding the Fourth Proportional to 149.72, 224.30 and 77.48

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Solution

The fourth proportional to 149.72, 224.30 and 77.48 is: 116.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.72 : 224.30 = 77.48 : x
  2. Step 2: Convert to fraction form
    149.72/224.30 = 77.48/x
  3. Step 3: Cross multiply
    149.72x = 224.30 × 77.48
  4. Step 4: Simplify right side
    149.72x = 17,378.76
  5. Step 5: Solve for x
    x = 17,378.76/149.72
  6. Step 6: Final answer
    x = 116.08

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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.