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Finding the Fourth Proportional to 72.60, 99.98 and 71.09

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Solution

The fourth proportional to 72.60, 99.98 and 71.09 is: 97.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.60 : 99.98 = 71.09 : x
  2. Step 2: Convert to fraction form
    72.60/99.98 = 71.09/x
  3. Step 3: Cross multiply
    72.60x = 99.98 × 71.09
  4. Step 4: Simplify right side
    72.60x = 7,107.58
  5. Step 5: Solve for x
    x = 7,107.58/72.60
  6. Step 6: Final answer
    x = 97.90

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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.