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Finding the Fourth Proportional to 874.55, 1,207.29 and 543.20

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Solution

The fourth proportional to 874.55, 1,207.29 and 543.20 is: 749.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.55 : 1,207.29 = 543.20 : x
  2. Step 2: Convert to fraction form
    874.55/1,207.29 = 543.20/x
  3. Step 3: Cross multiply
    874.55x = 1,207.29 × 543.20
  4. Step 4: Simplify right side
    874.55x = 655,793.89
  5. Step 5: Solve for x
    x = 655,793.89/874.55
  6. Step 6: Final answer
    x = 749.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.