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Finding the Fourth Proportional to 813.84, 1,227.14 and 745.80

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Solution

The fourth proportional to 813.84, 1,227.14 and 745.80 is: 1,124.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.84 : 1,227.14 = 745.80 : x
  2. Step 2: Convert to fraction form
    813.84/1,227.14 = 745.80/x
  3. Step 3: Cross multiply
    813.84x = 1,227.14 × 745.80
  4. Step 4: Simplify right side
    813.84x = 915,201.01
  5. Step 5: Solve for x
    x = 915,201.01/813.84
  6. Step 6: Final answer
    x = 1,124.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.