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Finding the Fourth Proportional to 116.47, 160.74 and 72.20

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Solution

The fourth proportional to 116.47, 160.74 and 72.20 is: 99.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.47 : 160.74 = 72.20 : x
  2. Step 2: Convert to fraction form
    116.47/160.74 = 72.20/x
  3. Step 3: Cross multiply
    116.47x = 160.74 × 72.20
  4. Step 4: Simplify right side
    116.47x = 11,604.82
  5. Step 5: Solve for x
    x = 11,604.82/116.47
  6. Step 6: Final answer
    x = 99.64

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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.