Home / 21,321.09-31,981.41-7,280.96

Finding the Fourth Proportional to 21,321.09, 31,981.41 and 7,280.96

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Solution

The fourth proportional to 21,321.09, 31,981.41 and 7,280.96 is: 10,921.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.09 : 31,981.41 = 7,280.96 : x
  2. Step 2: Convert to fraction form
    21,321.09/31,981.41 = 7,280.96/x
  3. Step 3: Cross multiply
    21,321.09x = 31,981.41 × 7,280.96
  4. Step 4: Simplify right side
    21,321.09x = 232,855,207.05
  5. Step 5: Solve for x
    x = 232,855,207.05/21,321.09
  6. Step 6: Final answer
    x = 10,921.36

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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.