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Finding the Fourth Proportional to 148, 204.20 and 115.18

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Solution

The fourth proportional to 148, 204.20 and 115.18 is: 158.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    148 : 204.20 = 115.18 : x
  2. Step 2: Convert to fraction form
    148/204.20 = 115.18/x
  3. Step 3: Cross multiply
    148x = 204.20 × 115.18
  4. Step 4: Simplify right side
    148x = 23,519.76
  5. Step 5: Solve for x
    x = 23,519.76/148
  6. Step 6: Final answer
    x = 158.92

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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.