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Finding the Fourth Proportional to 309.32, 423.52 and 308.24

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Solution

The fourth proportional to 309.32, 423.52 and 308.24 is: 422.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.32 : 423.52 = 308.24 : x
  2. Step 2: Convert to fraction form
    309.32/423.52 = 308.24/x
  3. Step 3: Cross multiply
    309.32x = 423.52 × 308.24
  4. Step 4: Simplify right side
    309.32x = 130,545.80
  5. Step 5: Solve for x
    x = 130,545.80/309.32
  6. Step 6: Final answer
    x = 422.04

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.