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Finding the Fourth Proportional to 470.49, 649.53 and 387.87

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Solution

The fourth proportional to 470.49, 649.53 and 387.87 is: 535.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.49 : 649.53 = 387.87 : x
  2. Step 2: Convert to fraction form
    470.49/649.53 = 387.87/x
  3. Step 3: Cross multiply
    470.49x = 649.53 × 387.87
  4. Step 4: Simplify right side
    470.49x = 251,933.20
  5. Step 5: Solve for x
    x = 251,933.20/470.49
  6. Step 6: Final answer
    x = 535.47

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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.