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Finding the Fourth Proportional to 69.86, 96.42 and 55.32

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Solution

The fourth proportional to 69.86, 96.42 and 55.32 is: 76.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.86 : 96.42 = 55.32 : x
  2. Step 2: Convert to fraction form
    69.86/96.42 = 55.32/x
  3. Step 3: Cross multiply
    69.86x = 96.42 × 55.32
  4. Step 4: Simplify right side
    69.86x = 5,333.95
  5. Step 5: Solve for x
    x = 5,333.95/69.86
  6. Step 6: Final answer
    x = 76.35

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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.