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Finding the Fourth Proportional to 148.28, 203.79 and 139.10

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Solution

The fourth proportional to 148.28, 203.79 and 139.10 is: 191.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.28 : 203.79 = 139.10 : x
  2. Step 2: Convert to fraction form
    148.28/203.79 = 139.10/x
  3. Step 3: Cross multiply
    148.28x = 203.79 × 139.10
  4. Step 4: Simplify right side
    148.28x = 28,347.96
  5. Step 5: Solve for x
    x = 28,347.96/148.28
  6. Step 6: Final answer
    x = 191.18

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.