Home / 1,538.25-2,122.80-839.64

Finding the Fourth Proportional to 1,538.25, 2,122.80 and 839.64

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Solution

The fourth proportional to 1,538.25, 2,122.80 and 839.64 is: 1,158.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.25 : 2,122.80 = 839.64 : x
  2. Step 2: Convert to fraction form
    1,538.25/2,122.80 = 839.64/x
  3. Step 3: Cross multiply
    1,538.25x = 2,122.80 × 839.64
  4. Step 4: Simplify right side
    1,538.25x = 1,782,387.79
  5. Step 5: Solve for x
    x = 1,782,387.79/1,538.25
  6. Step 6: Final answer
    x = 1,158.71

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1.5x scale

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.