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Finding the Fourth Proportional to 21,616.31, 29,830.51 and 11,680.31

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Solution

The fourth proportional to 21,616.31, 29,830.51 and 11,680.31 is: 16,118.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,616.31 : 29,830.51 = 11,680.31 : x
  2. Step 2: Convert to fraction form
    21,616.31/29,830.51 = 11,680.31/x
  3. Step 3: Cross multiply
    21,616.31x = 29,830.51 × 11,680.31
  4. Step 4: Simplify right side
    21,616.31x = 348,429,604.26
  5. Step 5: Solve for x
    x = 348,429,604.26/21,616.31
  6. Step 6: Final answer
    x = 16,118.83

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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.