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Finding the Fourth Proportional to 837.96, 1,257.20 and 318.20

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Solution

The fourth proportional to 837.96, 1,257.20 and 318.20 is: 477.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.96 : 1,257.20 = 318.20 : x
  2. Step 2: Convert to fraction form
    837.96/1,257.20 = 318.20/x
  3. Step 3: Cross multiply
    837.96x = 1,257.20 × 318.20
  4. Step 4: Simplify right side
    837.96x = 400,041.04
  5. Step 5: Solve for x
    x = 400,041.04/837.96
  6. Step 6: Final answer
    x = 477.40

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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.