Home / 10,138.28-13,989.12-5,661.86

Finding the Fourth Proportional to 10,138.28, 13,989.12 and 5,661.86

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Solution

The fourth proportional to 10,138.28, 13,989.12 and 5,661.86 is: 7,812.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,138.28 : 13,989.12 = 5,661.86 : x
  2. Step 2: Convert to fraction form
    10,138.28/13,989.12 = 5,661.86/x
  3. Step 3: Cross multiply
    10,138.28x = 13,989.12 × 5,661.86
  4. Step 4: Simplify right side
    10,138.28x = 79,204,438.96
  5. Step 5: Solve for x
    x = 79,204,438.96/10,138.28
  6. Step 6: Final answer
    x = 7,812.41

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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.