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Finding the Fourth Proportional to 18,902.80, 26,086.08 and 10,405.90

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Solution

The fourth proportional to 18,902.80, 26,086.08 and 10,405.90 is: 14,360.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,902.80 : 26,086.08 = 10,405.90 : x
  2. Step 2: Convert to fraction form
    18,902.80/26,086.08 = 10,405.90/x
  3. Step 3: Cross multiply
    18,902.80x = 26,086.08 × 10,405.90
  4. Step 4: Simplify right side
    18,902.80x = 271,449,139.87
  5. Step 5: Solve for x
    x = 271,449,139.87/18,902.80
  6. Step 6: Final answer
    x = 14,360.26

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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.