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Finding the Fourth Proportional to 77.32, 116.55 and 76.63

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Solution

The fourth proportional to 77.32, 116.55 and 76.63 is: 115.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.32 : 116.55 = 76.63 : x
  2. Step 2: Convert to fraction form
    77.32/116.55 = 76.63/x
  3. Step 3: Cross multiply
    77.32x = 116.55 × 76.63
  4. Step 4: Simplify right side
    77.32x = 8,931.23
  5. Step 5: Solve for x
    x = 8,931.23/77.32
  6. Step 6: Final answer
    x = 115.51

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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.