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Finding the Fourth Proportional to 148.56, 221.30 and 140.28

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Solution

The fourth proportional to 148.56, 221.30 and 140.28 is: 208.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.56 : 221.30 = 140.28 : x
  2. Step 2: Convert to fraction form
    148.56/221.30 = 140.28/x
  3. Step 3: Cross multiply
    148.56x = 221.30 × 140.28
  4. Step 4: Simplify right side
    148.56x = 31,043.26
  5. Step 5: Solve for x
    x = 31,043.26/148.56
  6. Step 6: Final answer
    x = 208.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.