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Finding the Fourth Proportional to 649.76, 896.54 and 387.86

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Solution

The fourth proportional to 649.76, 896.54 and 387.86 is: 535.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.76 : 896.54 = 387.86 : x
  2. Step 2: Convert to fraction form
    649.76/896.54 = 387.86/x
  3. Step 3: Cross multiply
    649.76x = 896.54 × 387.86
  4. Step 4: Simplify right side
    649.76x = 347,725.58
  5. Step 5: Solve for x
    x = 347,725.58/649.76
  6. Step 6: Final answer
    x = 535.16

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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.