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Finding the Fourth Proportional to 69.59, 95.47 and 65.45

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Solution

The fourth proportional to 69.59, 95.47 and 65.45 is: 89.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.59 : 95.47 = 65.45 : x
  2. Step 2: Convert to fraction form
    69.59/95.47 = 65.45/x
  3. Step 3: Cross multiply
    69.59x = 95.47 × 65.45
  4. Step 4: Simplify right side
    69.59x = 6,248.18
  5. Step 5: Solve for x
    x = 6,248.18/69.59
  6. Step 6: Final answer
    x = 89.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.