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Finding the Fourth Proportional to 26,280.60, 39,420.90 and 20,405.40

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Solution

The fourth proportional to 26,280.60, 39,420.90 and 20,405.40 is: 30,608.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,280.60 : 39,420.90 = 20,405.40 : x
  2. Step 2: Convert to fraction form
    26,280.60/39,420.90 = 20,405.40/x
  3. Step 3: Cross multiply
    26,280.60x = 39,420.90 × 20,405.40
  4. Step 4: Simplify right side
    26,280.60x = 804,399,232.86
  5. Step 5: Solve for x
    x = 804,399,232.86/26,280.60
  6. Step 6: Final answer
    x = 30,608.10

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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.