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Finding the Fourth Proportional to 18,718, 25,809.78 and 15,304.36

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Solution

The fourth proportional to 18,718, 25,809.78 and 15,304.36 is: 21,102.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718 : 25,809.78 = 15,304.36 : x
  2. Step 2: Convert to fraction form
    18,718/25,809.78 = 15,304.36/x
  3. Step 3: Cross multiply
    18,718x = 25,809.78 × 15,304.36
  4. Step 4: Simplify right side
    18,718x = 395,002,164.64
  5. Step 5: Solve for x
    x = 395,002,164.64/18,718
  6. Step 6: Final answer
    x = 21,102.80

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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.