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Finding the Fourth Proportional to 12,490.39, 18,730.09 and 6,645.61

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Solution

The fourth proportional to 12,490.39, 18,730.09 and 6,645.61 is: 9,965.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,490.39 : 18,730.09 = 6,645.61 : x
  2. Step 2: Convert to fraction form
    12,490.39/18,730.09 = 6,645.61/x
  3. Step 3: Cross multiply
    12,490.39x = 18,730.09 × 6,645.61
  4. Step 4: Simplify right side
    12,490.39x = 124,472,873.40
  5. Step 5: Solve for x
    x = 124,472,873.40/12,490.39
  6. Step 6: Final answer
    x = 9,965.49

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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.