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Finding the Fourth Proportional to 98.99, 136.68 and 67.90

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Solution

The fourth proportional to 98.99, 136.68 and 67.90 is: 93.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.99 : 136.68 = 67.90 : x
  2. Step 2: Convert to fraction form
    98.99/136.68 = 67.90/x
  3. Step 3: Cross multiply
    98.99x = 136.68 × 67.90
  4. Step 4: Simplify right side
    98.99x = 9,280.23
  5. Step 5: Solve for x
    x = 9,280.23/98.99
  6. Step 6: Final answer
    x = 93.75

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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.