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Finding the Fourth Proportional to 811.23, 1,216.88 and 263.42

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Solution

The fourth proportional to 811.23, 1,216.88 and 263.42 is: 395.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.23 : 1,216.88 = 263.42 : x
  2. Step 2: Convert to fraction form
    811.23/1,216.88 = 263.42/x
  3. Step 3: Cross multiply
    811.23x = 1,216.88 × 263.42
  4. Step 4: Simplify right side
    811.23x = 320,543.13
  5. Step 5: Solve for x
    x = 320,543.13/811.23
  6. Step 6: Final answer
    x = 395.13

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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.