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Finding the Fourth Proportional to 15,899.22, 21,936.96 and 9,928.71

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Solution

The fourth proportional to 15,899.22, 21,936.96 and 9,928.71 is: 13,699.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,899.22 : 21,936.96 = 9,928.71 : x
  2. Step 2: Convert to fraction form
    15,899.22/21,936.96 = 9,928.71/x
  3. Step 3: Cross multiply
    15,899.22x = 21,936.96 × 9,928.71
  4. Step 4: Simplify right side
    15,899.22x = 217,805,714.12
  5. Step 5: Solve for x
    x = 217,805,714.12/15,899.22
  6. Step 6: Final answer
    x = 13,699.14

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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.