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Finding the Fourth Proportional to 112.96, 169.49 and 78.30

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Solution

The fourth proportional to 112.96, 169.49 and 78.30 is: 117.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.96 : 169.49 = 78.30 : x
  2. Step 2: Convert to fraction form
    112.96/169.49 = 78.30/x
  3. Step 3: Cross multiply
    112.96x = 169.49 × 78.30
  4. Step 4: Simplify right side
    112.96x = 13,271.68
  5. Step 5: Solve for x
    x = 13,271.68/112.96
  6. Step 6: Final answer
    x = 117.49

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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.