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Finding the Fourth Proportional to 18,781.98, 25,920.45 and 10,399.02

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Solution

The fourth proportional to 18,781.98, 25,920.45 and 10,399.02 is: 14,351.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.98 : 25,920.45 = 10,399.02 : x
  2. Step 2: Convert to fraction form
    18,781.98/25,920.45 = 10,399.02/x
  3. Step 3: Cross multiply
    18,781.98x = 25,920.45 × 10,399.02
  4. Step 4: Simplify right side
    18,781.98x = 269,547,277.96
  5. Step 5: Solve for x
    x = 269,547,277.96/18,781.98
  6. Step 6: Final answer
    x = 14,351.38

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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.