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Finding the Fourth Proportional to 12,490.25, 18,644.25 and 10,913.81

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Solution

The fourth proportional to 12,490.25, 18,644.25 and 10,913.81 is: 16,291.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,490.25 : 18,644.25 = 10,913.81 : x
  2. Step 2: Convert to fraction form
    12,490.25/18,644.25 = 10,913.81/x
  3. Step 3: Cross multiply
    12,490.25x = 18,644.25 × 10,913.81
  4. Step 4: Simplify right side
    12,490.25x = 203,479,848.70
  5. Step 5: Solve for x
    x = 203,479,848.70/12,490.25
  6. Step 6: Final answer
    x = 16,291.10

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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.