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Finding the Fourth Proportional to 1,147.31, 1,720.60 and 325.61

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Solution

The fourth proportional to 1,147.31, 1,720.60 and 325.61 is: 488.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.31 : 1,720.60 = 325.61 : x
  2. Step 2: Convert to fraction form
    1,147.31/1,720.60 = 325.61/x
  3. Step 3: Cross multiply
    1,147.31x = 1,720.60 × 325.61
  4. Step 4: Simplify right side
    1,147.31x = 560,235.15
  5. Step 5: Solve for x
    x = 560,235.15/1,147.31
  6. Step 6: Final answer
    x = 488.31

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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.