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Finding the Fourth Proportional to 170.15, 254.84 and 78.72

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Solution

The fourth proportional to 170.15, 254.84 and 78.72 is: 117.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.15 : 254.84 = 78.72 : x
  2. Step 2: Convert to fraction form
    170.15/254.84 = 78.72/x
  3. Step 3: Cross multiply
    170.15x = 254.84 × 78.72
  4. Step 4: Simplify right side
    170.15x = 20,060.61
  5. Step 5: Solve for x
    x = 20,060.61/170.15
  6. Step 6: Final answer
    x = 117.90

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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.