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Finding the Fourth Proportional to 15,661.97, 21,613.61 and 8,491.94

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Solution

The fourth proportional to 15,661.97, 21,613.61 and 8,491.94 is: 11,718.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,661.97 : 21,613.61 = 8,491.94 : x
  2. Step 2: Convert to fraction form
    15,661.97/21,613.61 = 8,491.94/x
  3. Step 3: Cross multiply
    15,661.97x = 21,613.61 × 8,491.94
  4. Step 4: Simplify right side
    15,661.97x = 183,541,479.30
  5. Step 5: Solve for x
    x = 183,541,479.30/15,661.97
  6. Step 6: Final answer
    x = 11,718.93

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1.5x scale

Why These Related Problems?

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