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Finding the Fourth Proportional to 353.52, 530.21 and 207.21

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Solution

The fourth proportional to 353.52, 530.21 and 207.21 is: 310.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.52 : 530.21 = 207.21 : x
  2. Step 2: Convert to fraction form
    353.52/530.21 = 207.21/x
  3. Step 3: Cross multiply
    353.52x = 530.21 × 207.21
  4. Step 4: Simplify right side
    353.52x = 109,863.78
  5. Step 5: Solve for x
    x = 109,863.78/353.52
  6. Step 6: Final answer
    x = 310.77

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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.