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Finding the Fourth Proportional to 833.91, 1,250.91 and 256.78

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Solution

The fourth proportional to 833.91, 1,250.91 and 256.78 is: 385.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.91 : 1,250.91 = 256.78 : x
  2. Step 2: Convert to fraction form
    833.91/1,250.91 = 256.78/x
  3. Step 3: Cross multiply
    833.91x = 1,250.91 × 256.78
  4. Step 4: Simplify right side
    833.91x = 321,210.23
  5. Step 5: Solve for x
    x = 321,210.23/833.91
  6. Step 6: Final answer
    x = 385.19

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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.