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Finding the Fourth Proportional to 28,272.92, 42,402.90 and 12,695

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Solution

The fourth proportional to 28,272.92, 42,402.90 and 12,695 is: 19,039.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,272.92 : 42,402.90 = 12,695 : x
  2. Step 2: Convert to fraction form
    28,272.92/42,402.90 = 12,695/x
  3. Step 3: Cross multiply
    28,272.92x = 42,402.90 × 12,695
  4. Step 4: Simplify right side
    28,272.92x = 538,304,815.50
  5. Step 5: Solve for x
    x = 538,304,815.50/28,272.92
  6. Step 6: Final answer
    x = 19,039.59

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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.