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Finding the Fourth Proportional to 502.05, 753.21 and 405.43

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Solution

The fourth proportional to 502.05, 753.21 and 405.43 is: 608.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.05 : 753.21 = 405.43 : x
  2. Step 2: Convert to fraction form
    502.05/753.21 = 405.43/x
  3. Step 3: Cross multiply
    502.05x = 753.21 × 405.43
  4. Step 4: Simplify right side
    502.05x = 305,372.17
  5. Step 5: Solve for x
    x = 305,372.17/502.05
  6. Step 6: Final answer
    x = 608.25

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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.