Home / 8,689.24-11,989.78-5,151.88

Finding the Fourth Proportional to 8,689.24, 11,989.78 and 5,151.88

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Solution

The fourth proportional to 8,689.24, 11,989.78 and 5,151.88 is: 7,108.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.24 : 11,989.78 = 5,151.88 : x
  2. Step 2: Convert to fraction form
    8,689.24/11,989.78 = 5,151.88/x
  3. Step 3: Cross multiply
    8,689.24x = 11,989.78 × 5,151.88
  4. Step 4: Simplify right side
    8,689.24x = 61,769,907.79
  5. Step 5: Solve for x
    x = 61,769,907.79/8,689.24
  6. Step 6: Final answer
    x = 7,108.78

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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.