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Finding the Fourth Proportional to 18,891.92, 28,319.80 and 7,042.56

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Solution

The fourth proportional to 18,891.92, 28,319.80 and 7,042.56 is: 10,557.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.92 : 28,319.80 = 7,042.56 : x
  2. Step 2: Convert to fraction form
    18,891.92/28,319.80 = 7,042.56/x
  3. Step 3: Cross multiply
    18,891.92x = 28,319.80 × 7,042.56
  4. Step 4: Simplify right side
    18,891.92x = 199,443,890.69
  5. Step 5: Solve for x
    x = 199,443,890.69/18,891.92
  6. Step 6: Final answer
    x = 10,557.10

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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.