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Finding the Fourth Proportional to 815.72, 1,224.15 and 353.26

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Solution

The fourth proportional to 815.72, 1,224.15 and 353.26 is: 530.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.72 : 1,224.15 = 353.26 : x
  2. Step 2: Convert to fraction form
    815.72/1,224.15 = 353.26/x
  3. Step 3: Cross multiply
    815.72x = 1,224.15 × 353.26
  4. Step 4: Simplify right side
    815.72x = 432,444.92
  5. Step 5: Solve for x
    x = 432,444.92/815.72
  6. Step 6: Final answer
    x = 530.14

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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.