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Finding the Fourth Proportional to 19,311.90, 28,989.45 and 18,042.90

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Solution

The fourth proportional to 19,311.90, 28,989.45 and 18,042.90 is: 27,084.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,311.90 : 28,989.45 = 18,042.90 : x
  2. Step 2: Convert to fraction form
    19,311.90/28,989.45 = 18,042.90/x
  3. Step 3: Cross multiply
    19,311.90x = 28,989.45 × 18,042.90
  4. Step 4: Simplify right side
    19,311.90x = 523,053,747.41
  5. Step 5: Solve for x
    x = 523,053,747.41/19,311.90
  6. Step 6: Final answer
    x = 27,084.53

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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.