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Finding the Fourth Proportional to 816.68, 1,224.59 and 261.23

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Solution

The fourth proportional to 816.68, 1,224.59 and 261.23 is: 391.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.68 : 1,224.59 = 261.23 : x
  2. Step 2: Convert to fraction form
    816.68/1,224.59 = 261.23/x
  3. Step 3: Cross multiply
    816.68x = 1,224.59 × 261.23
  4. Step 4: Simplify right side
    816.68x = 319,892.22
  5. Step 5: Solve for x
    x = 319,892.22/816.68
  6. Step 6: Final answer
    x = 391.70

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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.