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Finding the Fourth Proportional to 425.19, 640.46 and 386.92

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Solution

The fourth proportional to 425.19, 640.46 and 386.92 is: 582.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.19 : 640.46 = 386.92 : x
  2. Step 2: Convert to fraction form
    425.19/640.46 = 386.92/x
  3. Step 3: Cross multiply
    425.19x = 640.46 × 386.92
  4. Step 4: Simplify right side
    425.19x = 247,806.78
  5. Step 5: Solve for x
    x = 247,806.78/425.19
  6. Step 6: Final answer
    x = 582.81

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.