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Finding the Fourth Proportional to 28,270.92, 42,399.90 and 12,693

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Solution

The fourth proportional to 28,270.92, 42,399.90 and 12,693 is: 19,036.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,270.92 : 42,399.90 = 12,693 : x
  2. Step 2: Convert to fraction form
    28,270.92/42,399.90 = 12,693/x
  3. Step 3: Cross multiply
    28,270.92x = 42,399.90 × 12,693
  4. Step 4: Simplify right side
    28,270.92x = 538,181,930.70
  5. Step 5: Solve for x
    x = 538,181,930.70/28,270.92
  6. Step 6: Final answer
    x = 19,036.59

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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.