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Finding the Fourth Proportional to 28,691.25, 42,993.05 and 12,042.20

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Solution

The fourth proportional to 28,691.25, 42,993.05 and 12,042.20 is: 18,044.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,691.25 : 42,993.05 = 12,042.20 : x
  2. Step 2: Convert to fraction form
    28,691.25/42,993.05 = 12,042.20/x
  3. Step 3: Cross multiply
    28,691.25x = 42,993.05 × 12,042.20
  4. Step 4: Simplify right side
    28,691.25x = 517,731,055.59
  5. Step 5: Solve for x
    x = 517,731,055.59/28,691.25
  6. Step 6: Final answer
    x = 18,044.91

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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.