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Finding the Fourth Proportional to 22,372.60, 30,871.78 and 12,939.32

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Solution

The fourth proportional to 22,372.60, 30,871.78 and 12,939.32 is: 17,854.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,372.60 : 30,871.78 = 12,939.32 : x
  2. Step 2: Convert to fraction form
    22,372.60/30,871.78 = 12,939.32/x
  3. Step 3: Cross multiply
    22,372.60x = 30,871.78 × 12,939.32
  4. Step 4: Simplify right side
    22,372.60x = 399,459,840.39
  5. Step 5: Solve for x
    x = 399,459,840.39/22,372.60
  6. Step 6: Final answer
    x = 17,854.87

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1.5x scale

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.