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Finding the Fourth Proportional to 425.96, 640.07 and 243.51

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Solution

The fourth proportional to 425.96, 640.07 and 243.51 is: 365.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.96 : 640.07 = 243.51 : x
  2. Step 2: Convert to fraction form
    425.96/640.07 = 243.51/x
  3. Step 3: Cross multiply
    425.96x = 640.07 × 243.51
  4. Step 4: Simplify right side
    425.96x = 155,860.74
  5. Step 5: Solve for x
    x = 155,860.74/425.96
  6. Step 6: Final answer
    x = 365.91

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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.