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Finding the Fourth Proportional to 10,856.88, 14,979.06 and 6,379.20

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Solution

The fourth proportional to 10,856.88, 14,979.06 and 6,379.20 is: 8,801.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,856.88 : 14,979.06 = 6,379.20 : x
  2. Step 2: Convert to fraction form
    10,856.88/14,979.06 = 6,379.20/x
  3. Step 3: Cross multiply
    10,856.88x = 14,979.06 × 6,379.20
  4. Step 4: Simplify right side
    10,856.88x = 95,554,419.55
  5. Step 5: Solve for x
    x = 95,554,419.55/10,856.88
  6. Step 6: Final answer
    x = 8,801.28

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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.