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Finding the Fourth Proportional to 3,613.52, 5,421.90 and 1,421.52

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Solution

The fourth proportional to 3,613.52, 5,421.90 and 1,421.52 is: 2,132.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,613.52 : 5,421.90 = 1,421.52 : x
  2. Step 2: Convert to fraction form
    3,613.52/5,421.90 = 1,421.52/x
  3. Step 3: Cross multiply
    3,613.52x = 5,421.90 × 1,421.52
  4. Step 4: Simplify right side
    3,613.52x = 7,707,339.29
  5. Step 5: Solve for x
    x = 7,707,339.29/3,613.52
  6. Step 6: Final answer
    x = 2,132.92

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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.