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Finding the Fourth Proportional to 684.10, 1,025.34 and 318.52

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Solution

The fourth proportional to 684.10, 1,025.34 and 318.52 is: 477.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.10 : 1,025.34 = 318.52 : x
  2. Step 2: Convert to fraction form
    684.10/1,025.34 = 318.52/x
  3. Step 3: Cross multiply
    684.10x = 1,025.34 × 318.52
  4. Step 4: Simplify right side
    684.10x = 326,591.30
  5. Step 5: Solve for x
    x = 326,591.30/684.10
  6. Step 6: Final answer
    x = 477.40

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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.