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Finding the Fourth Proportional to 891.54, 1,337.49 and 405.09

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Solution

The fourth proportional to 891.54, 1,337.49 and 405.09 is: 607.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.54 : 1,337.49 = 405.09 : x
  2. Step 2: Convert to fraction form
    891.54/1,337.49 = 405.09/x
  3. Step 3: Cross multiply
    891.54x = 1,337.49 × 405.09
  4. Step 4: Simplify right side
    891.54x = 541,803.82
  5. Step 5: Solve for x
    x = 541,803.82/891.54
  6. Step 6: Final answer
    x = 607.72

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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.