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Finding the Fourth Proportional to 5,747.28, 7,920.90 and 4,172.64

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Solution

The fourth proportional to 5,747.28, 7,920.90 and 4,172.64 is: 5,750.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,747.28 : 7,920.90 = 4,172.64 : x
  2. Step 2: Convert to fraction form
    5,747.28/7,920.90 = 4,172.64/x
  3. Step 3: Cross multiply
    5,747.28x = 7,920.90 × 4,172.64
  4. Step 4: Simplify right side
    5,747.28x = 33,051,064.18
  5. Step 5: Solve for x
    x = 33,051,064.18/5,747.28
  6. Step 6: Final answer
    x = 5,750.73

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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.