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Finding the Fourth Proportional to 2,570.36, 3,855.47 and 721.49

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Solution

The fourth proportional to 2,570.36, 3,855.47 and 721.49 is: 1,082.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,570.36 : 3,855.47 = 721.49 : x
  2. Step 2: Convert to fraction form
    2,570.36/3,855.47 = 721.49/x
  3. Step 3: Cross multiply
    2,570.36x = 3,855.47 × 721.49
  4. Step 4: Simplify right side
    2,570.36x = 2,781,660.17
  5. Step 5: Solve for x
    x = 2,781,660.17/2,570.36
  6. Step 6: Final answer
    x = 1,082.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.