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Finding the Fourth Proportional to 811.99, 1,217.95 and 401.00

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Solution

The fourth proportional to 811.99, 1,217.95 and 401.00 is: 601.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.99 : 1,217.95 = 401.00 : x
  2. Step 2: Convert to fraction form
    811.99/1,217.95 = 401.00/x
  3. Step 3: Cross multiply
    811.99x = 1,217.95 × 401.00
  4. Step 4: Simplify right side
    811.99x = 488,399.96
  5. Step 5: Solve for x
    x = 488,399.96/811.99
  6. Step 6: Final answer
    x = 601.48

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Double scale
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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.