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Finding the Fourth Proportional to 6,659.83, 9,989.74 and 1,979.81

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Solution

The fourth proportional to 6,659.83, 9,989.74 and 1,979.81 is: 2,969.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,659.83 : 9,989.74 = 1,979.81 : x
  2. Step 2: Convert to fraction form
    6,659.83/9,989.74 = 1,979.81/x
  3. Step 3: Cross multiply
    6,659.83x = 9,989.74 × 1,979.81
  4. Step 4: Simplify right side
    6,659.83x = 19,777,822.19
  5. Step 5: Solve for x
    x = 19,777,822.19/6,659.83
  6. Step 6: Final answer
    x = 2,969.72

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Similar ratio
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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.