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Finding the Fourth Proportional to 77.43, 116.20 and 43.18

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Solution

The fourth proportional to 77.43, 116.20 and 43.18 is: 64.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.43 : 116.20 = 43.18 : x
  2. Step 2: Convert to fraction form
    77.43/116.20 = 43.18/x
  3. Step 3: Cross multiply
    77.43x = 116.20 × 43.18
  4. Step 4: Simplify right side
    77.43x = 5,017.52
  5. Step 5: Solve for x
    x = 5,017.52/77.43
  6. Step 6: Final answer
    x = 64.80

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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.