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Finding the Fourth Proportional to 861.36, 1,291.44 and 450.72

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Solution

The fourth proportional to 861.36, 1,291.44 and 450.72 is: 675.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.36 : 1,291.44 = 450.72 : x
  2. Step 2: Convert to fraction form
    861.36/1,291.44 = 450.72/x
  3. Step 3: Cross multiply
    861.36x = 1,291.44 × 450.72
  4. Step 4: Simplify right side
    861.36x = 582,077.84
  5. Step 5: Solve for x
    x = 582,077.84/861.36
  6. Step 6: Final answer
    x = 675.77

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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.