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Finding the Fourth Proportional to 18,009.55, 26,979.90 and 9,686.80

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Solution

The fourth proportional to 18,009.55, 26,979.90 and 9,686.80 is: 14,511.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,009.55 : 26,979.90 = 9,686.80 : x
  2. Step 2: Convert to fraction form
    18,009.55/26,979.90 = 9,686.80/x
  3. Step 3: Cross multiply
    18,009.55x = 26,979.90 × 9,686.80
  4. Step 4: Simplify right side
    18,009.55x = 261,348,895.32
  5. Step 5: Solve for x
    x = 261,348,895.32/18,009.55
  6. Step 6: Final answer
    x = 14,511.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.