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Finding the Fourth Proportional to 1,152.21, 1,728.51 and 422.31

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Solution

The fourth proportional to 1,152.21, 1,728.51 and 422.31 is: 633.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.21 : 1,728.51 = 422.31 : x
  2. Step 2: Convert to fraction form
    1,152.21/1,728.51 = 422.31/x
  3. Step 3: Cross multiply
    1,152.21x = 1,728.51 × 422.31
  4. Step 4: Simplify right side
    1,152.21x = 729,967.06
  5. Step 5: Solve for x
    x = 729,967.06/1,152.21
  6. Step 6: Final answer
    x = 633.54

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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.