Home / 21,105.04-31,636.68-9,992.20

Finding the Fourth Proportional to 21,105.04, 31,636.68 and 9,992.20

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Solution

The fourth proportional to 21,105.04, 31,636.68 and 9,992.20 is: 14,978.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,105.04 : 31,636.68 = 9,992.20 : x
  2. Step 2: Convert to fraction form
    21,105.04/31,636.68 = 9,992.20/x
  3. Step 3: Cross multiply
    21,105.04x = 31,636.68 × 9,992.20
  4. Step 4: Simplify right side
    21,105.04x = 316,120,033.90
  5. Step 5: Solve for x
    x = 316,120,033.90/21,105.04
  6. Step 6: Final answer
    x = 14,978.41

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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.