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Finding the Fourth Proportional to 1,396.38, 1,927.01 and 872.71

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Solution

The fourth proportional to 1,396.38, 1,927.01 and 872.71 is: 1,204.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.38 : 1,927.01 = 872.71 : x
  2. Step 2: Convert to fraction form
    1,396.38/1,927.01 = 872.71/x
  3. Step 3: Cross multiply
    1,396.38x = 1,927.01 × 872.71
  4. Step 4: Simplify right side
    1,396.38x = 1,681,720.90
  5. Step 5: Solve for x
    x = 1,681,720.90/1,396.38
  6. Step 6: Final answer
    x = 1,204.34

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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.