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Finding the Fourth Proportional to 149.79, 224.37 and 77.70

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Solution

The fourth proportional to 149.79, 224.37 and 77.70 is: 116.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.79 : 224.37 = 77.70 : x
  2. Step 2: Convert to fraction form
    149.79/224.37 = 77.70/x
  3. Step 3: Cross multiply
    149.79x = 224.37 × 77.70
  4. Step 4: Simplify right side
    149.79x = 17,433.55
  5. Step 5: Solve for x
    x = 17,433.55/149.79
  6. Step 6: Final answer
    x = 116.39

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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.