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Finding the Fourth Proportional to 69.15, 103.52 and 42.02

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Solution

The fourth proportional to 69.15, 103.52 and 42.02 is: 62.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.15 : 103.52 = 42.02 : x
  2. Step 2: Convert to fraction form
    69.15/103.52 = 42.02/x
  3. Step 3: Cross multiply
    69.15x = 103.52 × 42.02
  4. Step 4: Simplify right side
    69.15x = 4,349.18
  5. Step 5: Solve for x
    x = 4,349.18/69.15
  6. Step 6: Final answer
    x = 62.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.