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Finding the Fourth Proportional to 117.93, 162.57 and 86.85

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Solution

The fourth proportional to 117.93, 162.57 and 86.85 is: 119.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.93 : 162.57 = 86.85 : x
  2. Step 2: Convert to fraction form
    117.93/162.57 = 86.85/x
  3. Step 3: Cross multiply
    117.93x = 162.57 × 86.85
  4. Step 4: Simplify right side
    117.93x = 14,119.20
  5. Step 5: Solve for x
    x = 14,119.20/117.93
  6. Step 6: Final answer
    x = 119.73

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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.