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Finding the Fourth Proportional to 149.66, 206.31 and 100.43

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Solution

The fourth proportional to 149.66, 206.31 and 100.43 is: 138.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.66 : 206.31 = 100.43 : x
  2. Step 2: Convert to fraction form
    149.66/206.31 = 100.43/x
  3. Step 3: Cross multiply
    149.66x = 206.31 × 100.43
  4. Step 4: Simplify right side
    149.66x = 20,719.71
  5. Step 5: Solve for x
    x = 20,719.71/149.66
  6. Step 6: Final answer
    x = 138.45

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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.