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Finding the Fourth Proportional to 903.21, 1,355.15 and 355.38

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Solution

The fourth proportional to 903.21, 1,355.15 and 355.38 is: 533.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.21 : 1,355.15 = 355.38 : x
  2. Step 2: Convert to fraction form
    903.21/1,355.15 = 355.38/x
  3. Step 3: Cross multiply
    903.21x = 1,355.15 × 355.38
  4. Step 4: Simplify right side
    903.21x = 481,593.21
  5. Step 5: Solve for x
    x = 481,593.21/903.21
  6. Step 6: Final answer
    x = 533.20

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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.