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Finding the Fourth Proportional to 1,151.91, 1,728.08 and 422.01

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Solution

The fourth proportional to 1,151.91, 1,728.08 and 422.01 is: 633.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.91 : 1,728.08 = 422.01 : x
  2. Step 2: Convert to fraction form
    1,151.91/1,728.08 = 422.01/x
  3. Step 3: Cross multiply
    1,151.91x = 1,728.08 × 422.01
  4. Step 4: Simplify right side
    1,151.91x = 729,264.93
  5. Step 5: Solve for x
    x = 729,264.93/1,151.91
  6. Step 6: Final answer
    x = 633.09

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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.