Home / 1,538.21-2,122.71-839.59

Finding the Fourth Proportional to 1,538.21, 2,122.71 and 839.59

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Solution

The fourth proportional to 1,538.21, 2,122.71 and 839.59 is: 1,158.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.21 : 2,122.71 = 839.59 : x
  2. Step 2: Convert to fraction form
    1,538.21/2,122.71 = 839.59/x
  3. Step 3: Cross multiply
    1,538.21x = 2,122.71 × 839.59
  4. Step 4: Simplify right side
    1,538.21x = 1,782,206.09
  5. Step 5: Solve for x
    x = 1,782,206.09/1,538.21
  6. Step 6: Final answer
    x = 1,158.62

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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.