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Finding the Fourth Proportional to 1,027.40, 1,418.45 and 634.55

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Solution

The fourth proportional to 1,027.40, 1,418.45 and 634.55 is: 876.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,027.40 : 1,418.45 = 634.55 : x
  2. Step 2: Convert to fraction form
    1,027.40/1,418.45 = 634.55/x
  3. Step 3: Cross multiply
    1,027.40x = 1,418.45 × 634.55
  4. Step 4: Simplify right side
    1,027.40x = 900,067.18
  5. Step 5: Solve for x
    x = 900,067.18/1,027.40
  6. Step 6: Final answer
    x = 876.07

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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.