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Finding the Fourth Proportional to 26,640.91, 39,949.98 and 9,989.40

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Solution

The fourth proportional to 26,640.91, 39,949.98 and 9,989.40 is: 14,979.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,640.91 : 39,949.98 = 9,989.40 : x
  2. Step 2: Convert to fraction form
    26,640.91/39,949.98 = 9,989.40/x
  3. Step 3: Cross multiply
    26,640.91x = 39,949.98 × 9,989.40
  4. Step 4: Simplify right side
    26,640.91x = 399,076,330.21
  5. Step 5: Solve for x
    x = 399,076,330.21/26,640.91
  6. Step 6: Final answer
    x = 14,979.83

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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.