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Finding the Fourth Proportional to 866.48, 1,299.90 and 318.66

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Solution

The fourth proportional to 866.48, 1,299.90 and 318.66 is: 478.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.48 : 1,299.90 = 318.66 : x
  2. Step 2: Convert to fraction form
    866.48/1,299.90 = 318.66/x
  3. Step 3: Cross multiply
    866.48x = 1,299.90 × 318.66
  4. Step 4: Simplify right side
    866.48x = 414,226.13
  5. Step 5: Solve for x
    x = 414,226.13/866.48
  6. Step 6: Final answer
    x = 478.06

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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.