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Finding the Fourth Proportional to 18,761.64, 25,881.66 and 12,381.53

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Solution

The fourth proportional to 18,761.64, 25,881.66 and 12,381.53 is: 17,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.64 : 25,881.66 = 12,381.53 : x
  2. Step 2: Convert to fraction form
    18,761.64/25,881.66 = 12,381.53/x
  3. Step 3: Cross multiply
    18,761.64x = 25,881.66 × 12,381.53
  4. Step 4: Simplify right side
    18,761.64x = 320,454,420.33
  5. Step 5: Solve for x
    x = 320,454,420.33/18,761.64
  6. Step 6: Final answer
    x = 17,080.30

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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.