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Finding the Fourth Proportional to 10,853.88, 14,979 and 6,138.60

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Solution

The fourth proportional to 10,853.88, 14,979 and 6,138.60 is: 8,471.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,853.88 : 14,979 = 6,138.60 : x
  2. Step 2: Convert to fraction form
    10,853.88/14,979 = 6,138.60/x
  3. Step 3: Cross multiply
    10,853.88x = 14,979 × 6,138.60
  4. Step 4: Simplify right side
    10,853.88x = 91,950,089.40
  5. Step 5: Solve for x
    x = 91,950,089.40/10,853.88
  6. Step 6: Final answer
    x = 8,471.63

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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.