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Finding the Fourth Proportional to 69.52, 102.84 and 69.40

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Solution

The fourth proportional to 69.52, 102.84 and 69.40 is: 102.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.52 : 102.84 = 69.40 : x
  2. Step 2: Convert to fraction form
    69.52/102.84 = 69.40/x
  3. Step 3: Cross multiply
    69.52x = 102.84 × 69.40
  4. Step 4: Simplify right side
    69.52x = 7,137.10
  5. Step 5: Solve for x
    x = 7,137.10/69.52
  6. Step 6: Final answer
    x = 102.66

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.