Home / 6,389.28-8,812.80-4,989.60

Finding the Fourth Proportional to 6,389.28, 8,812.80 and 4,989.60

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Solution

The fourth proportional to 6,389.28, 8,812.80 and 4,989.60 is: 6,882.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,389.28 : 8,812.80 = 4,989.60 : x
  2. Step 2: Convert to fraction form
    6,389.28/8,812.80 = 4,989.60/x
  3. Step 3: Cross multiply
    6,389.28x = 8,812.80 × 4,989.60
  4. Step 4: Simplify right side
    6,389.28x = 43,972,346.88
  5. Step 5: Solve for x
    x = 43,972,346.88/6,389.28
  6. Step 6: Final answer
    x = 6,882.21

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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.