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Finding the Fourth Proportional to 77.43, 116.58 and 57.31

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Solution

The fourth proportional to 77.43, 116.58 and 57.31 is: 86.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.43 : 116.58 = 57.31 : x
  2. Step 2: Convert to fraction form
    77.43/116.58 = 57.31/x
  3. Step 3: Cross multiply
    77.43x = 116.58 × 57.31
  4. Step 4: Simplify right side
    77.43x = 6,680.72
  5. Step 5: Solve for x
    x = 6,680.72/77.43
  6. Step 6: Final answer
    x = 86.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.