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Finding the Fourth Proportional to 837.75, 1,256.66 and 317.70

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Solution

The fourth proportional to 837.75, 1,256.66 and 317.70 is: 476.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.75 : 1,256.66 = 317.70 : x
  2. Step 2: Convert to fraction form
    837.75/1,256.66 = 317.70/x
  3. Step 3: Cross multiply
    837.75x = 1,256.66 × 317.70
  4. Step 4: Simplify right side
    837.75x = 399,240.88
  5. Step 5: Solve for x
    x = 399,240.88/837.75
  6. Step 6: Final answer
    x = 476.56

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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.