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Finding the Fourth Proportional to 502.21, 751.74 and 387.10

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Solution

The fourth proportional to 502.21, 751.74 and 387.10 is: 579.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.21 : 751.74 = 387.10 : x
  2. Step 2: Convert to fraction form
    502.21/751.74 = 387.10/x
  3. Step 3: Cross multiply
    502.21x = 751.74 × 387.10
  4. Step 4: Simplify right side
    502.21x = 290,998.55
  5. Step 5: Solve for x
    x = 290,998.55/502.21
  6. Step 6: Final answer
    x = 579.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.