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Finding the Fourth Proportional to 148.49, 205.14 and 121.10

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Solution

The fourth proportional to 148.49, 205.14 and 121.10 is: 167.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.49 : 205.14 = 121.10 : x
  2. Step 2: Convert to fraction form
    148.49/205.14 = 121.10/x
  3. Step 3: Cross multiply
    148.49x = 205.14 × 121.10
  4. Step 4: Simplify right side
    148.49x = 24,842.45
  5. Step 5: Solve for x
    x = 24,842.45/148.49
  6. Step 6: Final answer
    x = 167.30

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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.