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Finding the Fourth Proportional to 15,889.83, 21,928.26 and 8,720.09

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Solution

The fourth proportional to 15,889.83, 21,928.26 and 8,720.09 is: 12,033.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,889.83 : 21,928.26 = 8,720.09 : x
  2. Step 2: Convert to fraction form
    15,889.83/21,928.26 = 8,720.09/x
  3. Step 3: Cross multiply
    15,889.83x = 21,928.26 × 8,720.09
  4. Step 4: Simplify right side
    15,889.83x = 191,216,400.74
  5. Step 5: Solve for x
    x = 191,216,400.74/15,889.83
  6. Step 6: Final answer
    x = 12,033.89

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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.