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Finding the Fourth Proportional to 132.30, 198.54 and 78.18

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Solution

The fourth proportional to 132.30, 198.54 and 78.18 is: 117.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.30 : 198.54 = 78.18 : x
  2. Step 2: Convert to fraction form
    132.30/198.54 = 78.18/x
  3. Step 3: Cross multiply
    132.30x = 198.54 × 78.18
  4. Step 4: Simplify right side
    132.30x = 15,521.86
  5. Step 5: Solve for x
    x = 15,521.86/132.30
  6. Step 6: Final answer
    x = 117.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.