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Finding the Fourth Proportional to 1,538.05, 2,122.39 and 874.91

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Solution

The fourth proportional to 1,538.05, 2,122.39 and 874.91 is: 1,207.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.05 : 2,122.39 = 874.91 : x
  2. Step 2: Convert to fraction form
    1,538.05/2,122.39 = 874.91/x
  3. Step 3: Cross multiply
    1,538.05x = 2,122.39 × 874.91
  4. Step 4: Simplify right side
    1,538.05x = 1,856,900.23
  5. Step 5: Solve for x
    x = 1,856,900.23/1,538.05
  6. Step 6: Final answer
    x = 1,207.31

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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.