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Finding the Fourth Proportional to 1,613.76, 2,421.09 and 518.43

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Solution

The fourth proportional to 1,613.76, 2,421.09 and 518.43 is: 777.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.76 : 2,421.09 = 518.43 : x
  2. Step 2: Convert to fraction form
    1,613.76/2,421.09 = 518.43/x
  3. Step 3: Cross multiply
    1,613.76x = 2,421.09 × 518.43
  4. Step 4: Simplify right side
    1,613.76x = 1,255,174.77
  5. Step 5: Solve for x
    x = 1,255,174.77/1,613.76
  6. Step 6: Final answer
    x = 777.80

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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.