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Finding the Fourth Proportional to 843.10, 1,263.90 and 453.31

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Solution

The fourth proportional to 843.10, 1,263.90 and 453.31 is: 679.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.10 : 1,263.90 = 453.31 : x
  2. Step 2: Convert to fraction form
    843.10/1,263.90 = 453.31/x
  3. Step 3: Cross multiply
    843.10x = 1,263.90 × 453.31
  4. Step 4: Simplify right side
    843.10x = 572,938.51
  5. Step 5: Solve for x
    x = 572,938.51/843.10
  6. Step 6: Final answer
    x = 679.56

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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.