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Finding the Fourth Proportional to 866.48, 1,299.74 and 318.56

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Solution

The fourth proportional to 866.48, 1,299.74 and 318.56 is: 477.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.48 : 1,299.74 = 318.56 : x
  2. Step 2: Convert to fraction form
    866.48/1,299.74 = 318.56/x
  3. Step 3: Cross multiply
    866.48x = 1,299.74 × 318.56
  4. Step 4: Simplify right side
    866.48x = 414,037.08
  5. Step 5: Solve for x
    x = 414,037.08/866.48
  6. Step 6: Final answer
    x = 477.84

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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.