Home / 5,128.78-7,077.72-2,770.92

Finding the Fourth Proportional to 5,128.78, 7,077.72 and 2,770.92

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Solution

The fourth proportional to 5,128.78, 7,077.72 and 2,770.92 is: 3,823.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.78 : 7,077.72 = 2,770.92 : x
  2. Step 2: Convert to fraction form
    5,128.78/7,077.72 = 2,770.92/x
  3. Step 3: Cross multiply
    5,128.78x = 7,077.72 × 2,770.92
  4. Step 4: Simplify right side
    5,128.78x = 19,611,795.90
  5. Step 5: Solve for x
    x = 19,611,795.90/5,128.78
  6. Step 6: Final answer
    x = 3,823.87

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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.