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Finding the Fourth Proportional to 813.72, 1,218.76 and 795.48

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Solution

The fourth proportional to 813.72, 1,218.76 and 795.48 is: 1,191.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.72 : 1,218.76 = 795.48 : x
  2. Step 2: Convert to fraction form
    813.72/1,218.76 = 795.48/x
  3. Step 3: Cross multiply
    813.72x = 1,218.76 × 795.48
  4. Step 4: Simplify right side
    813.72x = 969,499.20
  5. Step 5: Solve for x
    x = 969,499.20/813.72
  6. Step 6: Final answer
    x = 1,191.44

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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.