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Finding the Fourth Proportional to 12,490.31, 18,644.34 and 10,913.88

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Solution

The fourth proportional to 12,490.31, 18,644.34 and 10,913.88 is: 16,291.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,490.31 : 18,644.34 = 10,913.88 : x
  2. Step 2: Convert to fraction form
    12,490.31/18,644.34 = 10,913.88/x
  3. Step 3: Cross multiply
    12,490.31x = 18,644.34 × 10,913.88
  4. Step 4: Simplify right side
    12,490.31x = 203,481,996.22
  5. Step 5: Solve for x
    x = 203,481,996.22/12,490.31
  6. Step 6: Final answer
    x = 16,291.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.