Home / 1,529.28-2,109.78-939.60

Finding the Fourth Proportional to 1,529.28, 2,109.78 and 939.60

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Solution

The fourth proportional to 1,529.28, 2,109.78 and 939.60 is: 1,296.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,529.28 : 2,109.78 = 939.60 : x
  2. Step 2: Convert to fraction form
    1,529.28/2,109.78 = 939.60/x
  3. Step 3: Cross multiply
    1,529.28x = 2,109.78 × 939.60
  4. Step 4: Simplify right side
    1,529.28x = 1,982,349.29
  5. Step 5: Solve for x
    x = 1,982,349.29/1,529.28
  6. Step 6: Final answer
    x = 1,296.26

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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.