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Finding the Fourth Proportional to 866.37, 1,299.80 and 404.47

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Solution

The fourth proportional to 866.37, 1,299.80 and 404.47 is: 606.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.37 : 1,299.80 = 404.47 : x
  2. Step 2: Convert to fraction form
    866.37/1,299.80 = 404.47/x
  3. Step 3: Cross multiply
    866.37x = 1,299.80 × 404.47
  4. Step 4: Simplify right side
    866.37x = 525,723.61
  5. Step 5: Solve for x
    x = 525,723.61/866.37
  6. Step 6: Final answer
    x = 606.82

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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.