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Finding the Fourth Proportional to 147.18, 203.21 and 91.91

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Solution

The fourth proportional to 147.18, 203.21 and 91.91 is: 126.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.18 : 203.21 = 91.91 : x
  2. Step 2: Convert to fraction form
    147.18/203.21 = 91.91/x
  3. Step 3: Cross multiply
    147.18x = 203.21 × 91.91
  4. Step 4: Simplify right side
    147.18x = 18,675.56
  5. Step 5: Solve for x
    x = 18,675.56/147.18
  6. Step 6: Final answer
    x = 126.89

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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.