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Finding the Fourth Proportional to 645.86, 968.13 and 255.70

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Solution

The fourth proportional to 645.86, 968.13 and 255.70 is: 383.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.86 : 968.13 = 255.70 : x
  2. Step 2: Convert to fraction form
    645.86/968.13 = 255.70/x
  3. Step 3: Cross multiply
    645.86x = 968.13 × 255.70
  4. Step 4: Simplify right side
    645.86x = 247,551.98
  5. Step 5: Solve for x
    x = 247,551.98/645.86
  6. Step 6: Final answer
    x = 383.29

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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.