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Finding the Fourth Proportional to 684.46, 1,025.34 and 318.88

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Solution

The fourth proportional to 684.46, 1,025.34 and 318.88 is: 477.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.46 : 1,025.34 = 318.88 : x
  2. Step 2: Convert to fraction form
    684.46/1,025.34 = 318.88/x
  3. Step 3: Cross multiply
    684.46x = 1,025.34 × 318.88
  4. Step 4: Simplify right side
    684.46x = 326,960.42
  5. Step 5: Solve for x
    x = 326,960.42/684.46
  6. Step 6: Final answer
    x = 477.69

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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.