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Finding the Fourth Proportional to 117.95, 162.47 and 86.78

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Solution

The fourth proportional to 117.95, 162.47 and 86.78 is: 119.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.95 : 162.47 = 86.78 : x
  2. Step 2: Convert to fraction form
    117.95/162.47 = 86.78/x
  3. Step 3: Cross multiply
    117.95x = 162.47 × 86.78
  4. Step 4: Simplify right side
    117.95x = 14,099.15
  5. Step 5: Solve for x
    x = 14,099.15/117.95
  6. Step 6: Final answer
    x = 119.53

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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.