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Finding the Fourth Proportional to 101.70, 153.30 and 91.26

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Solution

The fourth proportional to 101.70, 153.30 and 91.26 is: 137.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.70 : 153.30 = 91.26 : x
  2. Step 2: Convert to fraction form
    101.70/153.30 = 91.26/x
  3. Step 3: Cross multiply
    101.70x = 153.30 × 91.26
  4. Step 4: Simplify right side
    101.70x = 13,990.16
  5. Step 5: Solve for x
    x = 13,990.16/101.70
  6. Step 6: Final answer
    x = 137.56

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.