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Finding the Fourth Proportional to 21,359.17, 29,446 and 18,406.45

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Solution

The fourth proportional to 21,359.17, 29,446 and 18,406.45 is: 25,375.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,359.17 : 29,446 = 18,406.45 : x
  2. Step 2: Convert to fraction form
    21,359.17/29,446 = 18,406.45/x
  3. Step 3: Cross multiply
    21,359.17x = 29,446 × 18,406.45
  4. Step 4: Simplify right side
    21,359.17x = 541,996,326.70
  5. Step 5: Solve for x
    x = 541,996,326.70/21,359.17
  6. Step 6: Final answer
    x = 25,375.35

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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.