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Finding the Fourth Proportional to 578.72, 867.49 and 318.20

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Solution

The fourth proportional to 578.72, 867.49 and 318.20 is: 476.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.72 : 867.49 = 318.20 : x
  2. Step 2: Convert to fraction form
    578.72/867.49 = 318.20/x
  3. Step 3: Cross multiply
    578.72x = 867.49 × 318.20
  4. Step 4: Simplify right side
    578.72x = 276,030.19
  5. Step 5: Solve for x
    x = 276,030.19/578.72
  6. Step 6: Final answer
    x = 476.96

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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.