Home / 8,128.17-11,222.28-4,989.78

Finding the Fourth Proportional to 8,128.17, 11,222.28 and 4,989.78

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Solution

The fourth proportional to 8,128.17, 11,222.28 and 4,989.78 is: 6,889.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.17 : 11,222.28 = 4,989.78 : x
  2. Step 2: Convert to fraction form
    8,128.17/11,222.28 = 4,989.78/x
  3. Step 3: Cross multiply
    8,128.17x = 11,222.28 × 4,989.78
  4. Step 4: Simplify right side
    8,128.17x = 55,996,708.30
  5. Step 5: Solve for x
    x = 55,996,708.30/8,128.17
  6. Step 6: Final answer
    x = 6,889.21

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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.