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Finding the Fourth Proportional to 1,353, 1,867.62 and 939.24

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Solution

The fourth proportional to 1,353, 1,867.62 and 939.24 is: 1,296.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353 : 1,867.62 = 939.24 : x
  2. Step 2: Convert to fraction form
    1,353/1,867.62 = 939.24/x
  3. Step 3: Cross multiply
    1,353x = 1,867.62 × 939.24
  4. Step 4: Simplify right side
    1,353x = 1,754,143.41
  5. Step 5: Solve for x
    x = 1,754,143.41/1,353
  6. Step 6: Final answer
    x = 1,296.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.