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Finding the Fourth Proportional to 28,781.91, 43,172.91 and 11,239.41

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Solution

The fourth proportional to 28,781.91, 43,172.91 and 11,239.41 is: 16,859.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,781.91 : 43,172.91 = 11,239.41 : x
  2. Step 2: Convert to fraction form
    28,781.91/43,172.91 = 11,239.41/x
  3. Step 3: Cross multiply
    28,781.91x = 43,172.91 × 11,239.41
  4. Step 4: Simplify right side
    28,781.91x = 485,238,036.38
  5. Step 5: Solve for x
    x = 485,238,036.38/28,781.91
  6. Step 6: Final answer
    x = 16,859.13

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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.