Home / 20,981.60-31,456.40-10,600.80

Finding the Fourth Proportional to 20,981.60, 31,456.40 and 10,600.80

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Solution

The fourth proportional to 20,981.60, 31,456.40 and 10,600.80 is: 15,893.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.60 : 31,456.40 = 10,600.80 : x
  2. Step 2: Convert to fraction form
    20,981.60/31,456.40 = 10,600.80/x
  3. Step 3: Cross multiply
    20,981.60x = 31,456.40 × 10,600.80
  4. Step 4: Simplify right side
    20,981.60x = 333,463,005.12
  5. Step 5: Solve for x
    x = 333,463,005.12/20,981.60
  6. Step 6: Final answer
    x = 15,893.12

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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.