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Finding the Fourth Proportional to 21,689.52, 29,931.54 and 11,753.52

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Solution

The fourth proportional to 21,689.52, 29,931.54 and 11,753.52 is: 16,219.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.52 : 29,931.54 = 11,753.52 : x
  2. Step 2: Convert to fraction form
    21,689.52/29,931.54 = 11,753.52/x
  3. Step 3: Cross multiply
    21,689.52x = 29,931.54 × 11,753.52
  4. Step 4: Simplify right side
    21,689.52x = 351,800,954.02
  5. Step 5: Solve for x
    x = 351,800,954.02/21,689.52
  6. Step 6: Final answer
    x = 16,219.86

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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.