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Finding the Fourth Proportional to 116.99, 161.45 and 72.72

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Solution

The fourth proportional to 116.99, 161.45 and 72.72 is: 100.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.99 : 161.45 = 72.72 : x
  2. Step 2: Convert to fraction form
    116.99/161.45 = 72.72/x
  3. Step 3: Cross multiply
    116.99x = 161.45 × 72.72
  4. Step 4: Simplify right side
    116.99x = 11,739.84
  5. Step 5: Solve for x
    x = 11,739.84/116.99
  6. Step 6: Final answer
    x = 100.35

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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.