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Finding the Fourth Proportional to 3,421.76, 5,129.13 and 1,574.21

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Solution

The fourth proportional to 3,421.76, 5,129.13 and 1,574.21 is: 2,359.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.76 : 5,129.13 = 1,574.21 : x
  2. Step 2: Convert to fraction form
    3,421.76/5,129.13 = 1,574.21/x
  3. Step 3: Cross multiply
    3,421.76x = 5,129.13 × 1,574.21
  4. Step 4: Simplify right side
    3,421.76x = 8,074,340.56
  5. Step 5: Solve for x
    x = 8,074,340.56/3,421.76
  6. Step 6: Final answer
    x = 2,359.71

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1.5x scale

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.