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Finding the Fourth Proportional to 851.45, 1,175.49 and 557.22

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Solution

The fourth proportional to 851.45, 1,175.49 and 557.22 is: 769.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.45 : 1,175.49 = 557.22 : x
  2. Step 2: Convert to fraction form
    851.45/1,175.49 = 557.22/x
  3. Step 3: Cross multiply
    851.45x = 1,175.49 × 557.22
  4. Step 4: Simplify right side
    851.45x = 655,008.86
  5. Step 5: Solve for x
    x = 655,008.86/851.45
  6. Step 6: Final answer
    x = 769.29

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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.