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Finding the Fourth Proportional to 813.93, 1,219.85 and 521.33

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Solution

The fourth proportional to 813.93, 1,219.85 and 521.33 is: 781.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.93 : 1,219.85 = 521.33 : x
  2. Step 2: Convert to fraction form
    813.93/1,219.85 = 521.33/x
  3. Step 3: Cross multiply
    813.93x = 1,219.85 × 521.33
  4. Step 4: Simplify right side
    813.93x = 635,935.69
  5. Step 5: Solve for x
    x = 635,935.69/813.93
  6. Step 6: Final answer
    x = 781.31

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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.