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Finding the Fourth Proportional to 903.61, 1,355.42 and 355.85

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Solution

The fourth proportional to 903.61, 1,355.42 and 355.85 is: 533.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.61 : 1,355.42 = 355.85 : x
  2. Step 2: Convert to fraction form
    903.61/1,355.42 = 355.85/x
  3. Step 3: Cross multiply
    903.61x = 1,355.42 × 355.85
  4. Step 4: Simplify right side
    903.61x = 482,326.21
  5. Step 5: Solve for x
    x = 482,326.21/903.61
  6. Step 6: Final answer
    x = 533.78

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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.