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Finding the Fourth Proportional to 5,428.71, 8,144.03 and 1,920.75

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Solution

The fourth proportional to 5,428.71, 8,144.03 and 1,920.75 is: 2,881.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428.71 : 8,144.03 = 1,920.75 : x
  2. Step 2: Convert to fraction form
    5,428.71/8,144.03 = 1,920.75/x
  3. Step 3: Cross multiply
    5,428.71x = 8,144.03 × 1,920.75
  4. Step 4: Simplify right side
    5,428.71x = 15,642,645.62
  5. Step 5: Solve for x
    x = 15,642,645.62/5,428.71
  6. Step 6: Final answer
    x = 2,881.47

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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.