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Finding the Fourth Proportional to 1,613.97, 2,421.63 and 518.65

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Solution

The fourth proportional to 1,613.97, 2,421.63 and 518.65 is: 778.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.97 : 2,421.63 = 518.65 : x
  2. Step 2: Convert to fraction form
    1,613.97/2,421.63 = 518.65/x
  3. Step 3: Cross multiply
    1,613.97x = 2,421.63 × 518.65
  4. Step 4: Simplify right side
    1,613.97x = 1,255,972.35
  5. Step 5: Solve for x
    x = 1,255,972.35/1,613.97
  6. Step 6: Final answer
    x = 778.19

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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.