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Finding the Fourth Proportional to 412.21, 568.38 and 387.10

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Solution

The fourth proportional to 412.21, 568.38 and 387.10 is: 533.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.21 : 568.38 = 387.10 : x
  2. Step 2: Convert to fraction form
    412.21/568.38 = 387.10/x
  3. Step 3: Cross multiply
    412.21x = 568.38 × 387.10
  4. Step 4: Simplify right side
    412.21x = 220,019.90
  5. Step 5: Solve for x
    x = 220,019.90/412.21
  6. Step 6: Final answer
    x = 533.76

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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.