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Finding the Fourth Proportional to 15,879.71, 21,915.80 and 9,167.14

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Solution

The fourth proportional to 15,879.71, 21,915.80 and 9,167.14 is: 12,651.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.71 : 21,915.80 = 9,167.14 : x
  2. Step 2: Convert to fraction form
    15,879.71/21,915.80 = 9,167.14/x
  3. Step 3: Cross multiply
    15,879.71x = 21,915.80 × 9,167.14
  4. Step 4: Simplify right side
    15,879.71x = 200,905,206.81
  5. Step 5: Solve for x
    x = 200,905,206.81/15,879.71
  6. Step 6: Final answer
    x = 12,651.69

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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.