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Finding the Fourth Proportional to 18,990.69, 26,204.90 and 11,436.90

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Solution

The fourth proportional to 18,990.69, 26,204.90 and 11,436.90 is: 15,781.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.69 : 26,204.90 = 11,436.90 : x
  2. Step 2: Convert to fraction form
    18,990.69/26,204.90 = 11,436.90/x
  3. Step 3: Cross multiply
    18,990.69x = 26,204.90 × 11,436.90
  4. Step 4: Simplify right side
    18,990.69x = 299,702,763.63
  5. Step 5: Solve for x
    x = 299,702,763.63/18,990.69
  6. Step 6: Final answer
    x = 15,781.56

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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.