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Finding the Fourth Proportional to 816.11, 1,223.80 and 260.66

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Solution

The fourth proportional to 816.11, 1,223.80 and 260.66 is: 390.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.11 : 1,223.80 = 260.66 : x
  2. Step 2: Convert to fraction form
    816.11/1,223.80 = 260.66/x
  3. Step 3: Cross multiply
    816.11x = 1,223.80 × 260.66
  4. Step 4: Simplify right side
    816.11x = 318,995.71
  5. Step 5: Solve for x
    x = 318,995.71/816.11
  6. Step 6: Final answer
    x = 390.87

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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.