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Finding the Fourth Proportional to 816.38, 1,225.10 and 303.38

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Solution

The fourth proportional to 816.38, 1,225.10 and 303.38 is: 455.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.38 : 1,225.10 = 303.38 : x
  2. Step 2: Convert to fraction form
    816.38/1,225.10 = 303.38/x
  3. Step 3: Cross multiply
    816.38x = 1,225.10 × 303.38
  4. Step 4: Simplify right side
    816.38x = 371,670.84
  5. Step 5: Solve for x
    x = 371,670.84/816.38
  6. Step 6: Final answer
    x = 455.27

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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.