Home / 1,613.21-2,420.19-689.57

Finding the Fourth Proportional to 1,613.21, 2,420.19 and 689.57

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Solution

The fourth proportional to 1,613.21, 2,420.19 and 689.57 is: 1,034.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.21 : 2,420.19 = 689.57 : x
  2. Step 2: Convert to fraction form
    1,613.21/2,420.19 = 689.57/x
  3. Step 3: Cross multiply
    1,613.21x = 2,420.19 × 689.57
  4. Step 4: Simplify right side
    1,613.21x = 1,668,890.42
  5. Step 5: Solve for x
    x = 1,668,890.42/1,613.21
  6. Step 6: Final answer
    x = 1,034.52

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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.