Home / 21,019.41-31,513.32-9,919.78

Finding the Fourth Proportional to 21,019.41, 31,513.32 and 9,919.78

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Solution

The fourth proportional to 21,019.41, 31,513.32 and 9,919.78 is: 14,872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,019.41 : 31,513.32 = 9,919.78 : x
  2. Step 2: Convert to fraction form
    21,019.41/31,513.32 = 9,919.78/x
  3. Step 3: Cross multiply
    21,019.41x = 31,513.32 × 9,919.78
  4. Step 4: Simplify right side
    21,019.41x = 312,605,122.69
  5. Step 5: Solve for x
    x = 312,605,122.69/21,019.41
  6. Step 6: Final answer
    x = 14,872.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.