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Finding the Fourth Proportional to 837.78, 1,256.70 and 260.70

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Solution

The fourth proportional to 837.78, 1,256.70 and 260.70 is: 391.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.78 : 1,256.70 = 260.70 : x
  2. Step 2: Convert to fraction form
    837.78/1,256.70 = 260.70/x
  3. Step 3: Cross multiply
    837.78x = 1,256.70 × 260.70
  4. Step 4: Simplify right side
    837.78x = 327,621.69
  5. Step 5: Solve for x
    x = 327,621.69/837.78
  6. Step 6: Final answer
    x = 391.06

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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.