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Finding the Fourth Proportional to 21,613.88, 29,827.16 and 11,677.88

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Solution

The fourth proportional to 21,613.88, 29,827.16 and 11,677.88 is: 16,115.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,613.88 : 29,827.16 = 11,677.88 : x
  2. Step 2: Convert to fraction form
    21,613.88/29,827.16 = 11,677.88/x
  3. Step 3: Cross multiply
    21,613.88x = 29,827.16 × 11,677.88
  4. Step 4: Simplify right side
    21,613.88x = 348,317,787.70
  5. Step 5: Solve for x
    x = 348,317,787.70/21,613.88
  6. Step 6: Final answer
    x = 16,115.47

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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.