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Finding the Fourth Proportional to 11,391.78, 15,720.60 and 6,423.78

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Solution

The fourth proportional to 11,391.78, 15,720.60 and 6,423.78 is: 8,864.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,391.78 : 15,720.60 = 6,423.78 : x
  2. Step 2: Convert to fraction form
    11,391.78/15,720.60 = 6,423.78/x
  3. Step 3: Cross multiply
    11,391.78x = 15,720.60 × 6,423.78
  4. Step 4: Simplify right side
    11,391.78x = 100,985,675.87
  5. Step 5: Solve for x
    x = 100,985,675.87/11,391.78
  6. Step 6: Final answer
    x = 8,864.78

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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.