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Finding the Fourth Proportional to 318.36, 439.12 and 283.62

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Solution

The fourth proportional to 318.36, 439.12 and 283.62 is: 391.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.36 : 439.12 = 283.62 : x
  2. Step 2: Convert to fraction form
    318.36/439.12 = 283.62/x
  3. Step 3: Cross multiply
    318.36x = 439.12 × 283.62
  4. Step 4: Simplify right side
    318.36x = 124,543.21
  5. Step 5: Solve for x
    x = 124,543.21/318.36
  6. Step 6: Final answer
    x = 391.20

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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.