Home / 5,135.78-7,087.20-2,897.72

Finding the Fourth Proportional to 5,135.78, 7,087.20 and 2,897.72

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Solution

The fourth proportional to 5,135.78, 7,087.20 and 2,897.72 is: 3,998.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,135.78 : 7,087.20 = 2,897.72 : x
  2. Step 2: Convert to fraction form
    5,135.78/7,087.20 = 2,897.72/x
  3. Step 3: Cross multiply
    5,135.78x = 7,087.20 × 2,897.72
  4. Step 4: Simplify right side
    5,135.78x = 20,536,721.18
  5. Step 5: Solve for x
    x = 20,536,721.18/5,135.78
  6. Step 6: Final answer
    x = 3,998.75

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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.