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Finding the Fourth Proportional to 649.69, 896.57 and 387.86

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Solution

The fourth proportional to 649.69, 896.57 and 387.86 is: 535.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.69 : 896.57 = 387.86 : x
  2. Step 2: Convert to fraction form
    649.69/896.57 = 387.86/x
  3. Step 3: Cross multiply
    649.69x = 896.57 × 387.86
  4. Step 4: Simplify right side
    649.69x = 347,738.67
  5. Step 5: Solve for x
    x = 347,738.67/649.69
  6. Step 6: Final answer
    x = 535.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.