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Finding the Fourth Proportional to 21,677.78, 32,516.21 and 9,990.99

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Solution

The fourth proportional to 21,677.78, 32,516.21 and 9,990.99 is: 14,986.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,677.78 : 32,516.21 = 9,990.99 : x
  2. Step 2: Convert to fraction form
    21,677.78/32,516.21 = 9,990.99/x
  3. Step 3: Cross multiply
    21,677.78x = 32,516.21 × 9,990.99
  4. Step 4: Simplify right side
    21,677.78x = 324,869,078.99
  5. Step 5: Solve for x
    x = 324,869,078.99/21,677.78
  6. Step 6: Final answer
    x = 14,986.27

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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.