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Finding the Fourth Proportional to 1,071.99, 1,608.21 and 422.79

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Solution

The fourth proportional to 1,071.99, 1,608.21 and 422.79 is: 634.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.99 : 1,608.21 = 422.79 : x
  2. Step 2: Convert to fraction form
    1,071.99/1,608.21 = 422.79/x
  3. Step 3: Cross multiply
    1,071.99x = 1,608.21 × 422.79
  4. Step 4: Simplify right side
    1,071.99x = 679,935.11
  5. Step 5: Solve for x
    x = 679,935.11/1,071.99
  6. Step 6: Final answer
    x = 634.27

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Double scale
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1.5x scale

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.