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Finding the Fourth Proportional to 5,173.88, 7,139.80 and 2,815.96

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Solution

The fourth proportional to 5,173.88, 7,139.80 and 2,815.96 is: 3,885.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,173.88 : 7,139.80 = 2,815.96 : x
  2. Step 2: Convert to fraction form
    5,173.88/7,139.80 = 2,815.96/x
  3. Step 3: Cross multiply
    5,173.88x = 7,139.80 × 2,815.96
  4. Step 4: Simplify right side
    5,173.88x = 20,105,391.21
  5. Step 5: Solve for x
    x = 20,105,391.21/5,173.88
  6. Step 6: Final answer
    x = 3,885.94

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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.