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Finding the Fourth Proportional to 813.01, 1,218.58 and 379.25

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Solution

The fourth proportional to 813.01, 1,218.58 and 379.25 is: 568.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.01 : 1,218.58 = 379.25 : x
  2. Step 2: Convert to fraction form
    813.01/1,218.58 = 379.25/x
  3. Step 3: Cross multiply
    813.01x = 1,218.58 × 379.25
  4. Step 4: Simplify right side
    813.01x = 462,146.47
  5. Step 5: Solve for x
    x = 462,146.47/813.01
  6. Step 6: Final answer
    x = 568.44

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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.