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Finding the Fourth Proportional to 69.68, 96.12 and 45.15

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Solution

The fourth proportional to 69.68, 96.12 and 45.15 is: 62.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.68 : 96.12 = 45.15 : x
  2. Step 2: Convert to fraction form
    69.68/96.12 = 45.15/x
  3. Step 3: Cross multiply
    69.68x = 96.12 × 45.15
  4. Step 4: Simplify right side
    69.68x = 4,339.82
  5. Step 5: Solve for x
    x = 4,339.82/69.68
  6. Step 6: Final answer
    x = 62.29

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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.