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Finding the Fourth Proportional to 71.31, 99.19 and 69.99

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Solution

The fourth proportional to 71.31, 99.19 and 69.99 is: 97.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.31 : 99.19 = 69.99 : x
  2. Step 2: Convert to fraction form
    71.31/99.19 = 69.99/x
  3. Step 3: Cross multiply
    71.31x = 99.19 × 69.99
  4. Step 4: Simplify right side
    71.31x = 6,942.31
  5. Step 5: Solve for x
    x = 6,942.31/71.31
  6. Step 6: Final answer
    x = 97.35

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.