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Finding the Fourth Proportional to 1,152.63, 1,729.20 and 422.21

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Solution

The fourth proportional to 1,152.63, 1,729.20 and 422.21 is: 633.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.63 : 1,729.20 = 422.21 : x
  2. Step 2: Convert to fraction form
    1,152.63/1,729.20 = 422.21/x
  3. Step 3: Cross multiply
    1,152.63x = 1,729.20 × 422.21
  4. Step 4: Simplify right side
    1,152.63x = 730,089.06
  5. Step 5: Solve for x
    x = 730,089.06/1,152.63
  6. Step 6: Final answer
    x = 633.41

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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.