Home / 8,680.60-11,980.78-5,145.56

Finding the Fourth Proportional to 8,680.60, 11,980.78 and 5,145.56

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Solution

The fourth proportional to 8,680.60, 11,980.78 and 5,145.56 is: 7,101.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,680.60 : 11,980.78 = 5,145.56 : x
  2. Step 2: Convert to fraction form
    8,680.60/11,980.78 = 5,145.56/x
  3. Step 3: Cross multiply
    8,680.60x = 11,980.78 × 5,145.56
  4. Step 4: Simplify right side
    8,680.60x = 61,647,822.34
  5. Step 5: Solve for x
    x = 61,647,822.34/8,680.60
  6. Step 6: Final answer
    x = 7,101.79

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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.