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Finding the Fourth Proportional to 21,000.44, 31,500.89 and 8,990.97

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Solution

The fourth proportional to 21,000.44, 31,500.89 and 8,990.97 is: 13,486.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.44 : 31,500.89 = 8,990.97 : x
  2. Step 2: Convert to fraction form
    21,000.44/31,500.89 = 8,990.97/x
  3. Step 3: Cross multiply
    21,000.44x = 31,500.89 × 8,990.97
  4. Step 4: Simplify right side
    21,000.44x = 283,223,658.19
  5. Step 5: Solve for x
    x = 283,223,658.19/21,000.44
  6. Step 6: Final answer
    x = 13,486.56

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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.