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Finding the Fourth Proportional to 72.55, 99.45 and 70.73

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Solution

The fourth proportional to 72.55, 99.45 and 70.73 is: 96.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.55 : 99.45 = 70.73 : x
  2. Step 2: Convert to fraction form
    72.55/99.45 = 70.73/x
  3. Step 3: Cross multiply
    72.55x = 99.45 × 70.73
  4. Step 4: Simplify right side
    72.55x = 7,034.10
  5. Step 5: Solve for x
    x = 7,034.10/72.55
  6. Step 6: Final answer
    x = 96.96

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.