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Finding the Fourth Proportional to 18,712.08, 28,043.88 and 7,605.78

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Solution

The fourth proportional to 18,712.08, 28,043.88 and 7,605.78 is: 11,398.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.08 : 28,043.88 = 7,605.78 : x
  2. Step 2: Convert to fraction form
    18,712.08/28,043.88 = 7,605.78/x
  3. Step 3: Cross multiply
    18,712.08x = 28,043.88 × 7,605.78
  4. Step 4: Simplify right side
    18,712.08x = 213,295,581.63
  5. Step 5: Solve for x
    x = 213,295,581.63/18,712.08
  6. Step 6: Final answer
    x = 11,398.82

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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.