Home / 5,419.28-8,129.21-1,721.81

Finding the Fourth Proportional to 5,419.28, 8,129.21 and 1,721.81

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Solution

The fourth proportional to 5,419.28, 8,129.21 and 1,721.81 is: 2,582.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,419.28 : 8,129.21 = 1,721.81 : x
  2. Step 2: Convert to fraction form
    5,419.28/8,129.21 = 1,721.81/x
  3. Step 3: Cross multiply
    5,419.28x = 8,129.21 × 1,721.81
  4. Step 4: Simplify right side
    5,419.28x = 13,996,966.78
  5. Step 5: Solve for x
    x = 13,996,966.78/5,419.28
  6. Step 6: Final answer
    x = 2,582.81

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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.