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Finding the Fourth Proportional to 116.28, 160.30 and 99.88

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Solution

The fourth proportional to 116.28, 160.30 and 99.88 is: 137.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.28 : 160.30 = 99.88 : x
  2. Step 2: Convert to fraction form
    116.28/160.30 = 99.88/x
  3. Step 3: Cross multiply
    116.28x = 160.30 × 99.88
  4. Step 4: Simplify right side
    116.28x = 16,010.76
  5. Step 5: Solve for x
    x = 16,010.76/116.28
  6. Step 6: Final answer
    x = 137.69

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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.