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Finding the Fourth Proportional to 12,139.71, 16,744.62 and 7,659.70

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Solution

The fourth proportional to 12,139.71, 16,744.62 and 7,659.70 is: 10,565.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.71 : 16,744.62 = 7,659.70 : x
  2. Step 2: Convert to fraction form
    12,139.71/16,744.62 = 7,659.70/x
  3. Step 3: Cross multiply
    12,139.71x = 16,744.62 × 7,659.70
  4. Step 4: Simplify right side
    12,139.71x = 128,258,752.68
  5. Step 5: Solve for x
    x = 128,258,752.68/12,139.71
  6. Step 6: Final answer
    x = 10,565.23

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.