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Finding the Fourth Proportional to 149.28, 206.13 and 99.54

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Solution

The fourth proportional to 149.28, 206.13 and 99.54 is: 137.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.28 : 206.13 = 99.54 : x
  2. Step 2: Convert to fraction form
    149.28/206.13 = 99.54/x
  3. Step 3: Cross multiply
    149.28x = 206.13 × 99.54
  4. Step 4: Simplify right side
    149.28x = 20,518.18
  5. Step 5: Solve for x
    x = 20,518.18/149.28
  6. Step 6: Final answer
    x = 137.45

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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.