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Finding the Fourth Proportional to 841.27, 1,261.53 and 451.21

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Solution

The fourth proportional to 841.27, 1,261.53 and 451.21 is: 676.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.27 : 1,261.53 = 451.21 : x
  2. Step 2: Convert to fraction form
    841.27/1,261.53 = 451.21/x
  3. Step 3: Cross multiply
    841.27x = 1,261.53 × 451.21
  4. Step 4: Simplify right side
    841.27x = 569,214.95
  5. Step 5: Solve for x
    x = 569,214.95/841.27
  6. Step 6: Final answer
    x = 676.61

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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.