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Finding the Fourth Proportional to 148.64, 205.28 and 120.96

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Solution

The fourth proportional to 148.64, 205.28 and 120.96 is: 167.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.64 : 205.28 = 120.96 : x
  2. Step 2: Convert to fraction form
    148.64/205.28 = 120.96/x
  3. Step 3: Cross multiply
    148.64x = 205.28 × 120.96
  4. Step 4: Simplify right side
    148.64x = 24,830.67
  5. Step 5: Solve for x
    x = 24,830.67/148.64
  6. Step 6: Final answer
    x = 167.05

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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.