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Finding the Fourth Proportional to 21,691.92, 29,935.32 and 12,260.28

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Solution

The fourth proportional to 21,691.92, 29,935.32 and 12,260.28 is: 16,919.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,691.92 : 29,935.32 = 12,260.28 : x
  2. Step 2: Convert to fraction form
    21,691.92/29,935.32 = 12,260.28/x
  3. Step 3: Cross multiply
    21,691.92x = 29,935.32 × 12,260.28
  4. Step 4: Simplify right side
    21,691.92x = 367,015,405.09
  5. Step 5: Solve for x
    x = 367,015,405.09/21,691.92
  6. Step 6: Final answer
    x = 16,919.45

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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.