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Finding the Fourth Proportional to 113.80, 170.48 and 90.98

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Solution

The fourth proportional to 113.80, 170.48 and 90.98 is: 136.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.80 : 170.48 = 90.98 : x
  2. Step 2: Convert to fraction form
    113.80/170.48 = 90.98/x
  3. Step 3: Cross multiply
    113.80x = 170.48 × 90.98
  4. Step 4: Simplify right side
    113.80x = 15,510.27
  5. Step 5: Solve for x
    x = 15,510.27/113.80
  6. Step 6: Final answer
    x = 136.29

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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.