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Finding the Fourth Proportional to 816.44, 1,225.05 and 405.08

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Solution

The fourth proportional to 816.44, 1,225.05 and 405.08 is: 607.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.44 : 1,225.05 = 405.08 : x
  2. Step 2: Convert to fraction form
    816.44/1,225.05 = 405.08/x
  3. Step 3: Cross multiply
    816.44x = 1,225.05 × 405.08
  4. Step 4: Simplify right side
    816.44x = 496,243.25
  5. Step 5: Solve for x
    x = 496,243.25/816.44
  6. Step 6: Final answer
    x = 607.81

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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.