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Finding the Fourth Proportional to 19,786.71, 29,680.08 and 6,639.05

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Solution

The fourth proportional to 19,786.71, 29,680.08 and 6,639.05 is: 9,958.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,786.71 : 29,680.08 = 6,639.05 : x
  2. Step 2: Convert to fraction form
    19,786.71/29,680.08 = 6,639.05/x
  3. Step 3: Cross multiply
    19,786.71x = 29,680.08 × 6,639.05
  4. Step 4: Simplify right side
    19,786.71x = 197,047,386.72
  5. Step 5: Solve for x
    x = 197,047,386.72/19,786.71
  6. Step 6: Final answer
    x = 9,958.57

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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.