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Finding the Fourth Proportional to 1,027.76, 1,418.23 and 634.79

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Solution

The fourth proportional to 1,027.76, 1,418.23 and 634.79 is: 875.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,027.76 : 1,418.23 = 634.79 : x
  2. Step 2: Convert to fraction form
    1,027.76/1,418.23 = 634.79/x
  3. Step 3: Cross multiply
    1,027.76x = 1,418.23 × 634.79
  4. Step 4: Simplify right side
    1,027.76x = 900,278.22
  5. Step 5: Solve for x
    x = 900,278.22/1,027.76
  6. Step 6: Final answer
    x = 875.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.