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Finding the Fourth Proportional to 71.99, 99.07 and 66.19

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Solution

The fourth proportional to 71.99, 99.07 and 66.19 is: 91.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.99 : 99.07 = 66.19 : x
  2. Step 2: Convert to fraction form
    71.99/99.07 = 66.19/x
  3. Step 3: Cross multiply
    71.99x = 99.07 × 66.19
  4. Step 4: Simplify right side
    71.99x = 6,557.44
  5. Step 5: Solve for x
    x = 6,557.44/71.99
  6. Step 6: Final answer
    x = 91.09

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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.