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Finding the Fourth Proportional to 116.74, 161.16 and 77.47

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Solution

The fourth proportional to 116.74, 161.16 and 77.47 is: 106.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.74 : 161.16 = 77.47 : x
  2. Step 2: Convert to fraction form
    116.74/161.16 = 77.47/x
  3. Step 3: Cross multiply
    116.74x = 161.16 × 77.47
  4. Step 4: Simplify right side
    116.74x = 12,485.07
  5. Step 5: Solve for x
    x = 12,485.07/116.74
  6. Step 6: Final answer
    x = 106.95

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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.