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Finding the Fourth Proportional to 117.30, 161.87 and 64.85

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Solution

The fourth proportional to 117.30, 161.87 and 64.85 is: 89.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.30 : 161.87 = 64.85 : x
  2. Step 2: Convert to fraction form
    117.30/161.87 = 64.85/x
  3. Step 3: Cross multiply
    117.30x = 161.87 × 64.85
  4. Step 4: Simplify right side
    117.30x = 10,496.68
  5. Step 5: Solve for x
    x = 10,496.68/117.30
  6. Step 6: Final answer
    x = 89.48

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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.