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Finding the Fourth Proportional to 615.20, 923.20 and 355.20

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Solution

The fourth proportional to 615.20, 923.20 and 355.20 is: 533.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.20 : 923.20 = 355.20 : x
  2. Step 2: Convert to fraction form
    615.20/923.20 = 355.20/x
  3. Step 3: Cross multiply
    615.20x = 923.20 × 355.20
  4. Step 4: Simplify right side
    615.20x = 327,920.64
  5. Step 5: Solve for x
    x = 327,920.64/615.20
  6. Step 6: Final answer
    x = 533.03

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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.