Home / 20,158.06-27,830.56-12,990.50

Finding the Fourth Proportional to 20,158.06, 27,830.56 and 12,990.50

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Solution

The fourth proportional to 20,158.06, 27,830.56 and 12,990.50 is: 17,934.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,158.06 : 27,830.56 = 12,990.50 : x
  2. Step 2: Convert to fraction form
    20,158.06/27,830.56 = 12,990.50/x
  3. Step 3: Cross multiply
    20,158.06x = 27,830.56 × 12,990.50
  4. Step 4: Simplify right side
    20,158.06x = 361,532,889.68
  5. Step 5: Solve for x
    x = 361,532,889.68/20,158.06
  6. Step 6: Final answer
    x = 17,934.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.