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Finding the Fourth Proportional to 1,418.76, 2,128.73 and 638.55

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Solution

The fourth proportional to 1,418.76, 2,128.73 and 638.55 is: 958.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.76 : 2,128.73 = 638.55 : x
  2. Step 2: Convert to fraction form
    1,418.76/2,128.73 = 638.55/x
  3. Step 3: Cross multiply
    1,418.76x = 2,128.73 × 638.55
  4. Step 4: Simplify right side
    1,418.76x = 1,359,297.35
  5. Step 5: Solve for x
    x = 1,359,297.35/1,418.76
  6. Step 6: Final answer
    x = 958.09

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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.