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Finding the Fourth Proportional to 816.95, 1,225.59 and 427.13

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Solution

The fourth proportional to 816.95, 1,225.59 and 427.13 is: 640.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.95 : 1,225.59 = 427.13 : x
  2. Step 2: Convert to fraction form
    816.95/1,225.59 = 427.13/x
  3. Step 3: Cross multiply
    816.95x = 1,225.59 × 427.13
  4. Step 4: Simplify right side
    816.95x = 523,486.26
  5. Step 5: Solve for x
    x = 523,486.26/816.95
  6. Step 6: Final answer
    x = 640.78

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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.