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Finding the Fourth Proportional to 18,739, 25,881.78 and 12,440.44

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Solution

The fourth proportional to 18,739, 25,881.78 and 12,440.44 is: 17,182.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,739 : 25,881.78 = 12,440.44 : x
  2. Step 2: Convert to fraction form
    18,739/25,881.78 = 12,440.44/x
  3. Step 3: Cross multiply
    18,739x = 25,881.78 × 12,440.44
  4. Step 4: Simplify right side
    18,739x = 321,980,731.18
  5. Step 5: Solve for x
    x = 321,980,731.18/18,739
  6. Step 6: Final answer
    x = 17,182.39

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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.