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Finding the Fourth Proportional to 79.48, 119.24 and 31.40

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Solution

The fourth proportional to 79.48, 119.24 and 31.40 is: 47.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.48 : 119.24 = 31.40 : x
  2. Step 2: Convert to fraction form
    79.48/119.24 = 31.40/x
  3. Step 3: Cross multiply
    79.48x = 119.24 × 31.40
  4. Step 4: Simplify right side
    79.48x = 3,744.14
  5. Step 5: Solve for x
    x = 3,744.14/79.48
  6. Step 6: Final answer
    x = 47.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.