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Finding the Fourth Proportional to 2,172.45, 3,257.91 and 711.21

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Solution

The fourth proportional to 2,172.45, 3,257.91 and 711.21 is: 1,066.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.45 : 3,257.91 = 711.21 : x
  2. Step 2: Convert to fraction form
    2,172.45/3,257.91 = 711.21/x
  3. Step 3: Cross multiply
    2,172.45x = 3,257.91 × 711.21
  4. Step 4: Simplify right side
    2,172.45x = 2,317,058.17
  5. Step 5: Solve for x
    x = 2,317,058.17/2,172.45
  6. Step 6: Final answer
    x = 1,066.56

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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.