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Finding the Fourth Proportional to 21,687.78, 29,920.28 and 14,616.48

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Solution

The fourth proportional to 21,687.78, 29,920.28 and 14,616.48 is: 20,164.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.78 : 29,920.28 = 14,616.48 : x
  2. Step 2: Convert to fraction form
    21,687.78/29,920.28 = 14,616.48/x
  3. Step 3: Cross multiply
    21,687.78x = 29,920.28 × 14,616.48
  4. Step 4: Simplify right side
    21,687.78x = 437,329,101.13
  5. Step 5: Solve for x
    x = 437,329,101.13/21,687.78
  6. Step 6: Final answer
    x = 20,164.77

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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.