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Finding the Fourth Proportional to 472.12, 649.60 and 387.78

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Solution

The fourth proportional to 472.12, 649.60 and 387.78 is: 533.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.12 : 649.60 = 387.78 : x
  2. Step 2: Convert to fraction form
    472.12/649.60 = 387.78/x
  3. Step 3: Cross multiply
    472.12x = 649.60 × 387.78
  4. Step 4: Simplify right side
    472.12x = 251,901.89
  5. Step 5: Solve for x
    x = 251,901.89/472.12
  6. Step 6: Final answer
    x = 533.56

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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.