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Finding the Fourth Proportional to 149.45, 206.21 and 87.29

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Solution

The fourth proportional to 149.45, 206.21 and 87.29 is: 120.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.45 : 206.21 = 87.29 : x
  2. Step 2: Convert to fraction form
    149.45/206.21 = 87.29/x
  3. Step 3: Cross multiply
    149.45x = 206.21 × 87.29
  4. Step 4: Simplify right side
    149.45x = 17,999.95
  5. Step 5: Solve for x
    x = 17,999.95/149.45
  6. Step 6: Final answer
    x = 120.45

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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.