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Finding the Fourth Proportional to 106.98, 147.68 and 90.69

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Solution

The fourth proportional to 106.98, 147.68 and 90.69 is: 125.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.98 : 147.68 = 90.69 : x
  2. Step 2: Convert to fraction form
    106.98/147.68 = 90.69/x
  3. Step 3: Cross multiply
    106.98x = 147.68 × 90.69
  4. Step 4: Simplify right side
    106.98x = 13,392.65
  5. Step 5: Solve for x
    x = 13,392.65/106.98
  6. Step 6: Final answer
    x = 125.19

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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.