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Finding the Fourth Proportional to 861.88, 1,292.65 and 276.95

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Solution

The fourth proportional to 861.88, 1,292.65 and 276.95 is: 415.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.88 : 1,292.65 = 276.95 : x
  2. Step 2: Convert to fraction form
    861.88/1,292.65 = 276.95/x
  3. Step 3: Cross multiply
    861.88x = 1,292.65 × 276.95
  4. Step 4: Simplify right side
    861.88x = 357,999.42
  5. Step 5: Solve for x
    x = 357,999.42/861.88
  6. Step 6: Final answer
    x = 415.37

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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.