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Finding the Fourth Proportional to 816.99, 1,225.79 and 378.45

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Solution

The fourth proportional to 816.99, 1,225.79 and 378.45 is: 567.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.99 : 1,225.79 = 378.45 : x
  2. Step 2: Convert to fraction form
    816.99/1,225.79 = 378.45/x
  3. Step 3: Cross multiply
    816.99x = 1,225.79 × 378.45
  4. Step 4: Simplify right side
    816.99x = 463,892.20
  5. Step 5: Solve for x
    x = 463,892.20/816.99
  6. Step 6: Final answer
    x = 567.81

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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.