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Finding the Fourth Proportional to 147.70, 203.82 and 91.66

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Solution

The fourth proportional to 147.70, 203.82 and 91.66 is: 126.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.70 : 203.82 = 91.66 : x
  2. Step 2: Convert to fraction form
    147.70/203.82 = 91.66/x
  3. Step 3: Cross multiply
    147.70x = 203.82 × 91.66
  4. Step 4: Simplify right side
    147.70x = 18,682.14
  5. Step 5: Solve for x
    x = 18,682.14/147.70
  6. Step 6: Final answer
    x = 126.49

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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.