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Finding the Fourth Proportional to 523.72, 786.72 and 318.40

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Solution

The fourth proportional to 523.72, 786.72 and 318.40 is: 478.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.72 : 786.72 = 318.40 : x
  2. Step 2: Convert to fraction form
    523.72/786.72 = 318.40/x
  3. Step 3: Cross multiply
    523.72x = 786.72 × 318.40
  4. Step 4: Simplify right side
    523.72x = 250,491.65
  5. Step 5: Solve for x
    x = 250,491.65/523.72
  6. Step 6: Final answer
    x = 478.29

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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.