Home / 8,979.85-12,391.09-5,151.28

Finding the Fourth Proportional to 8,979.85, 12,391.09 and 5,151.28

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Solution

The fourth proportional to 8,979.85, 12,391.09 and 5,151.28 is: 7,108.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.85 : 12,391.09 = 5,151.28 : x
  2. Step 2: Convert to fraction form
    8,979.85/12,391.09 = 5,151.28/x
  3. Step 3: Cross multiply
    8,979.85x = 12,391.09 × 5,151.28
  4. Step 4: Simplify right side
    8,979.85x = 63,829,982.45
  5. Step 5: Solve for x
    x = 63,829,982.45/8,979.85
  6. Step 6: Final answer
    x = 7,108.14

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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.