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Finding the Fourth Proportional to 98.65, 136.27 and 90

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Solution

The fourth proportional to 98.65, 136.27 and 90 is: 124.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.65 : 136.27 = 90 : x
  2. Step 2: Convert to fraction form
    98.65/136.27 = 90/x
  3. Step 3: Cross multiply
    98.65x = 136.27 × 90
  4. Step 4: Simplify right side
    98.65x = 12,264.41
  5. Step 5: Solve for x
    x = 12,264.41/98.65
  6. Step 6: Final answer
    x = 124.32

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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.