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Finding the Fourth Proportional to 85.98, 118.61 and 69.58

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Solution

The fourth proportional to 85.98, 118.61 and 69.58 is: 95.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.98 : 118.61 = 69.58 : x
  2. Step 2: Convert to fraction form
    85.98/118.61 = 69.58/x
  3. Step 3: Cross multiply
    85.98x = 118.61 × 69.58
  4. Step 4: Simplify right side
    85.98x = 8,252.95
  5. Step 5: Solve for x
    x = 8,252.95/85.98
  6. Step 6: Final answer
    x = 95.98

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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.