Home / 21,321.20-31,981.80-11,465.12

Finding the Fourth Proportional to 21,321.20, 31,981.80 and 11,465.12

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Solution

The fourth proportional to 21,321.20, 31,981.80 and 11,465.12 is: 17,197.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.20 : 31,981.80 = 11,465.12 : x
  2. Step 2: Convert to fraction form
    21,321.20/31,981.80 = 11,465.12/x
  3. Step 3: Cross multiply
    21,321.20x = 31,981.80 × 11,465.12
  4. Step 4: Simplify right side
    21,321.20x = 366,675,174.82
  5. Step 5: Solve for x
    x = 366,675,174.82/21,321.20
  6. Step 6: Final answer
    x = 17,197.68

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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.