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Finding the Fourth Proportional to 21,656, 29,890.88 and 14,121.12

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Solution

The fourth proportional to 21,656, 29,890.88 and 14,121.12 is: 19,490.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,656 : 29,890.88 = 14,121.12 : x
  2. Step 2: Convert to fraction form
    21,656/29,890.88 = 14,121.12/x
  3. Step 3: Cross multiply
    21,656x = 29,890.88 × 14,121.12
  4. Step 4: Simplify right side
    21,656x = 422,092,703.39
  5. Step 5: Solve for x
    x = 422,092,703.39/21,656
  6. Step 6: Final answer
    x = 19,490.80

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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.