Home / 20,784.90-31,177.35-12,015.30

Finding the Fourth Proportional to 20,784.90, 31,177.35 and 12,015.30

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Solution

The fourth proportional to 20,784.90, 31,177.35 and 12,015.30 is: 18,022.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,784.90 : 31,177.35 = 12,015.30 : x
  2. Step 2: Convert to fraction form
    20,784.90/31,177.35 = 12,015.30/x
  3. Step 3: Cross multiply
    20,784.90x = 31,177.35 × 12,015.30
  4. Step 4: Simplify right side
    20,784.90x = 374,605,213.46
  5. Step 5: Solve for x
    x = 374,605,213.46/20,784.90
  6. Step 6: Final answer
    x = 18,022.95

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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.