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Finding the Fourth Proportional to 26,286.60, 39,429.90 and 20,411.40

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Solution

The fourth proportional to 26,286.60, 39,429.90 and 20,411.40 is: 30,617.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,286.60 : 39,429.90 = 20,411.40 : x
  2. Step 2: Convert to fraction form
    26,286.60/39,429.90 = 20,411.40/x
  3. Step 3: Cross multiply
    26,286.60x = 39,429.90 × 20,411.40
  4. Step 4: Simplify right side
    26,286.60x = 804,819,460.86
  5. Step 5: Solve for x
    x = 804,819,460.86/26,286.60
  6. Step 6: Final answer
    x = 30,617.10

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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.