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Finding the Fourth Proportional to 816.82, 1,225.23 and 425.86

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Solution

The fourth proportional to 816.82, 1,225.23 and 425.86 is: 638.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.82 : 1,225.23 = 425.86 : x
  2. Step 2: Convert to fraction form
    816.82/1,225.23 = 425.86/x
  3. Step 3: Cross multiply
    816.82x = 1,225.23 × 425.86
  4. Step 4: Simplify right side
    816.82x = 521,776.45
  5. Step 5: Solve for x
    x = 521,776.45/816.82
  6. Step 6: Final answer
    x = 638.79

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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.