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Finding the Fourth Proportional to 866.13, 1,299.20 and 403.66

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Solution

The fourth proportional to 866.13, 1,299.20 and 403.66 is: 605.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.13 : 1,299.20 = 403.66 : x
  2. Step 2: Convert to fraction form
    866.13/1,299.20 = 403.66/x
  3. Step 3: Cross multiply
    866.13x = 1,299.20 × 403.66
  4. Step 4: Simplify right side
    866.13x = 524,435.07
  5. Step 5: Solve for x
    x = 524,435.07/866.13
  6. Step 6: Final answer
    x = 605.49

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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.