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Finding the Fourth Proportional to 21,688.52, 29,930.16 and 11,752.52

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Solution

The fourth proportional to 21,688.52, 29,930.16 and 11,752.52 is: 16,218.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,688.52 : 29,930.16 = 11,752.52 : x
  2. Step 2: Convert to fraction form
    21,688.52/29,930.16 = 11,752.52/x
  3. Step 3: Cross multiply
    21,688.52x = 29,930.16 × 11,752.52
  4. Step 4: Simplify right side
    21,688.52x = 351,754,804.00
  5. Step 5: Solve for x
    x = 351,754,804.00/21,688.52
  6. Step 6: Final answer
    x = 16,218.48

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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.