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Finding the Fourth Proportional to 20,490.60, 30,735.90 and 18,084.90

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Solution

The fourth proportional to 20,490.60, 30,735.90 and 18,084.90 is: 27,127.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.60 : 30,735.90 = 18,084.90 : x
  2. Step 2: Convert to fraction form
    20,490.60/30,735.90 = 18,084.90/x
  3. Step 3: Cross multiply
    20,490.60x = 30,735.90 × 18,084.90
  4. Step 4: Simplify right side
    20,490.60x = 555,855,677.91
  5. Step 5: Solve for x
    x = 555,855,677.91/20,490.60
  6. Step 6: Final answer
    x = 27,127.35

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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.