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Finding the Fourth Proportional to 1,153.06, 1,729.40 and 422.64

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Solution

The fourth proportional to 1,153.06, 1,729.40 and 422.64 is: 633.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.06 : 1,729.40 = 422.64 : x
  2. Step 2: Convert to fraction form
    1,153.06/1,729.40 = 422.64/x
  3. Step 3: Cross multiply
    1,153.06x = 1,729.40 × 422.64
  4. Step 4: Simplify right side
    1,153.06x = 730,911.50
  5. Step 5: Solve for x
    x = 730,911.50/1,153.06
  6. Step 6: Final answer
    x = 633.89

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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.