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Finding the Fourth Proportional to 80.52, 121.20 and 56.64

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Solution

The fourth proportional to 80.52, 121.20 and 56.64 is: 85.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.52 : 121.20 = 56.64 : x
  2. Step 2: Convert to fraction form
    80.52/121.20 = 56.64/x
  3. Step 3: Cross multiply
    80.52x = 121.20 × 56.64
  4. Step 4: Simplify right side
    80.52x = 6,864.77
  5. Step 5: Solve for x
    x = 6,864.77/80.52
  6. Step 6: Final answer
    x = 85.26

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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.