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Finding the Fourth Proportional to 836.81, 1,255.31 and 790.74

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Solution

The fourth proportional to 836.81, 1,255.31 and 790.74 is: 1,186.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.81 : 1,255.31 = 790.74 : x
  2. Step 2: Convert to fraction form
    836.81/1,255.31 = 790.74/x
  3. Step 3: Cross multiply
    836.81x = 1,255.31 × 790.74
  4. Step 4: Simplify right side
    836.81x = 992,625.81
  5. Step 5: Solve for x
    x = 992,625.81/836.81
  6. Step 6: Final answer
    x = 1,186.21

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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.