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Finding the Fourth Proportional to 615.99, 850.20 and 405.81

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Solution

The fourth proportional to 615.99, 850.20 and 405.81 is: 560.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.99 : 850.20 = 405.81 : x
  2. Step 2: Convert to fraction form
    615.99/850.20 = 405.81/x
  3. Step 3: Cross multiply
    615.99x = 850.20 × 405.81
  4. Step 4: Simplify right side
    615.99x = 345,019.66
  5. Step 5: Solve for x
    x = 345,019.66/615.99
  6. Step 6: Final answer
    x = 560.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.