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Finding the Fourth Proportional to 813.45, 1,121.95 and 547.80

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Solution

The fourth proportional to 813.45, 1,121.95 and 547.80 is: 755.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.45 : 1,121.95 = 547.80 : x
  2. Step 2: Convert to fraction form
    813.45/1,121.95 = 547.80/x
  3. Step 3: Cross multiply
    813.45x = 1,121.95 × 547.80
  4. Step 4: Simplify right side
    813.45x = 614,604.21
  5. Step 5: Solve for x
    x = 614,604.21/813.45
  6. Step 6: Final answer
    x = 755.55

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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.