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Finding the Fourth Proportional to 318.50, 439.32 and 292.38

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Solution

The fourth proportional to 318.50, 439.32 and 292.38 is: 403.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.50 : 439.32 = 292.38 : x
  2. Step 2: Convert to fraction form
    318.50/439.32 = 292.38/x
  3. Step 3: Cross multiply
    318.50x = 439.32 × 292.38
  4. Step 4: Simplify right side
    318.50x = 128,448.38
  5. Step 5: Solve for x
    x = 128,448.38/318.50
  6. Step 6: Final answer
    x = 403.29

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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.