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Finding the Fourth Proportional to 149.47, 206.31 and 90.49

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Solution

The fourth proportional to 149.47, 206.31 and 90.49 is: 124.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.47 : 206.31 = 90.49 : x
  2. Step 2: Convert to fraction form
    149.47/206.31 = 90.49/x
  3. Step 3: Cross multiply
    149.47x = 206.31 × 90.49
  4. Step 4: Simplify right side
    149.47x = 18,668.99
  5. Step 5: Solve for x
    x = 18,668.99/149.47
  6. Step 6: Final answer
    x = 124.90

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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.