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Finding the Fourth Proportional to 816.13, 1,223.93 and 268.18

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Solution

The fourth proportional to 816.13, 1,223.93 and 268.18 is: 402.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.13 : 1,223.93 = 268.18 : x
  2. Step 2: Convert to fraction form
    816.13/1,223.93 = 268.18/x
  3. Step 3: Cross multiply
    816.13x = 1,223.93 × 268.18
  4. Step 4: Simplify right side
    816.13x = 328,232.21
  5. Step 5: Solve for x
    x = 328,232.21/816.13
  6. Step 6: Final answer
    x = 402.18

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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.