Home / 20,995.20-31,449.60-10,612.80

Finding the Fourth Proportional to 20,995.20, 31,449.60 and 10,612.80

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Solution

The fourth proportional to 20,995.20, 31,449.60 and 10,612.80 is: 15,897.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.20 : 31,449.60 = 10,612.80 : x
  2. Step 2: Convert to fraction form
    20,995.20/31,449.60 = 10,612.80/x
  3. Step 3: Cross multiply
    20,995.20x = 31,449.60 × 10,612.80
  4. Step 4: Simplify right side
    20,995.20x = 333,768,314.88
  5. Step 5: Solve for x
    x = 333,768,314.88/20,995.20
  6. Step 6: Final answer
    x = 15,897.36

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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.