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Finding the Fourth Proportional to 21,690.90, 29,932.29 and 12,258.90

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Solution

The fourth proportional to 21,690.90, 29,932.29 and 12,258.90 is: 16,916.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.90 : 29,932.29 = 12,258.90 : x
  2. Step 2: Convert to fraction form
    21,690.90/29,932.29 = 12,258.90/x
  3. Step 3: Cross multiply
    21,690.90x = 29,932.29 × 12,258.90
  4. Step 4: Simplify right side
    21,690.90x = 366,936,949.88
  5. Step 5: Solve for x
    x = 366,936,949.88/21,690.90
  6. Step 6: Final answer
    x = 16,916.63

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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.