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Finding the Fourth Proportional to 79.31, 118.34 and 70.19

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Solution

The fourth proportional to 79.31, 118.34 and 70.19 is: 104.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.31 : 118.34 = 70.19 : x
  2. Step 2: Convert to fraction form
    79.31/118.34 = 70.19/x
  3. Step 3: Cross multiply
    79.31x = 118.34 × 70.19
  4. Step 4: Simplify right side
    79.31x = 8,306.76
  5. Step 5: Solve for x
    x = 8,306.76/79.31
  6. Step 6: Final answer
    x = 104.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.