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Finding the Fourth Proportional to 684.37, 1,025.12 and 319.45

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Solution

The fourth proportional to 684.37, 1,025.12 and 319.45 is: 478.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.37 : 1,025.12 = 319.45 : x
  2. Step 2: Convert to fraction form
    684.37/1,025.12 = 319.45/x
  3. Step 3: Cross multiply
    684.37x = 1,025.12 × 319.45
  4. Step 4: Simplify right side
    684.37x = 327,472.99
  5. Step 5: Solve for x
    x = 327,472.99/684.37
  6. Step 6: Final answer
    x = 478.50

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Double scale
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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.