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Finding the Fourth Proportional to 684.28, 1,025.68 and 624.12

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Solution

The fourth proportional to 684.28, 1,025.68 and 624.12 is: 935.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.28 : 1,025.68 = 624.12 : x
  2. Step 2: Convert to fraction form
    684.28/1,025.68 = 624.12/x
  3. Step 3: Cross multiply
    684.28x = 1,025.68 × 624.12
  4. Step 4: Simplify right side
    684.28x = 640,147.40
  5. Step 5: Solve for x
    x = 640,147.40/684.28
  6. Step 6: Final answer
    x = 935.51

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1.5x scale

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.