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Finding the Fourth Proportional to 21,798.81, 32,731.01 and 12,449.38

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Solution

The fourth proportional to 21,798.81, 32,731.01 and 12,449.38 is: 18,692.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,798.81 : 32,731.01 = 12,449.38 : x
  2. Step 2: Convert to fraction form
    21,798.81/32,731.01 = 12,449.38/x
  3. Step 3: Cross multiply
    21,798.81x = 32,731.01 × 12,449.38
  4. Step 4: Simplify right side
    21,798.81x = 407,480,781.27
  5. Step 5: Solve for x
    x = 407,480,781.27/21,798.81
  6. Step 6: Final answer
    x = 18,692.80

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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.