Home / 1,419.11-2,129.20-638.88

Finding the Fourth Proportional to 1,419.11, 2,129.20 and 638.88

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Solution

The fourth proportional to 1,419.11, 2,129.20 and 638.88 is: 958.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.11 : 2,129.20 = 638.88 : x
  2. Step 2: Convert to fraction form
    1,419.11/2,129.20 = 638.88/x
  3. Step 3: Cross multiply
    1,419.11x = 2,129.20 × 638.88
  4. Step 4: Simplify right side
    1,419.11x = 1,360,301.70
  5. Step 5: Solve for x
    x = 1,360,301.70/1,419.11
  6. Step 6: Final answer
    x = 958.56

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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.