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Finding the Fourth Proportional to 71.88, 99.18 and 56.32

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Solution

The fourth proportional to 71.88, 99.18 and 56.32 is: 77.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.88 : 99.18 = 56.32 : x
  2. Step 2: Convert to fraction form
    71.88/99.18 = 56.32/x
  3. Step 3: Cross multiply
    71.88x = 99.18 × 56.32
  4. Step 4: Simplify right side
    71.88x = 5,585.82
  5. Step 5: Solve for x
    x = 5,585.82/71.88
  6. Step 6: Final answer
    x = 77.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.