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Finding the Fourth Proportional to 1,445.67, 2,168.31 and 521.10

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Solution

The fourth proportional to 1,445.67, 2,168.31 and 521.10 is: 781.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.67 : 2,168.31 = 521.10 : x
  2. Step 2: Convert to fraction form
    1,445.67/2,168.31 = 521.10/x
  3. Step 3: Cross multiply
    1,445.67x = 2,168.31 × 521.10
  4. Step 4: Simplify right side
    1,445.67x = 1,129,906.34
  5. Step 5: Solve for x
    x = 1,129,906.34/1,445.67
  6. Step 6: Final answer
    x = 781.58

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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.