Home / 21,105.68-31,622.14-13,985.48

Finding the Fourth Proportional to 21,105.68, 31,622.14 and 13,985.48

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Solution

The fourth proportional to 21,105.68, 31,622.14 and 13,985.48 is: 20,954.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,105.68 : 31,622.14 = 13,985.48 : x
  2. Step 2: Convert to fraction form
    21,105.68/31,622.14 = 13,985.48/x
  3. Step 3: Cross multiply
    21,105.68x = 31,622.14 × 13,985.48
  4. Step 4: Simplify right side
    21,105.68x = 442,250,806.53
  5. Step 5: Solve for x
    x = 442,250,806.53/21,105.68
  6. Step 6: Final answer
    x = 20,954.11

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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.