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Finding the Fourth Proportional to 117.18, 161.74 and 87.71

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Solution

The fourth proportional to 117.18, 161.74 and 87.71 is: 121.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.18 : 161.74 = 87.71 : x
  2. Step 2: Convert to fraction form
    117.18/161.74 = 87.71/x
  3. Step 3: Cross multiply
    117.18x = 161.74 × 87.71
  4. Step 4: Simplify right side
    117.18x = 14,185.19
  5. Step 5: Solve for x
    x = 14,185.19/117.18
  6. Step 6: Final answer
    x = 121.05

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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.