Home / 20,912.64-28,860.16-12,955.52

Finding the Fourth Proportional to 20,912.64, 28,860.16 and 12,955.52

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Solution

The fourth proportional to 20,912.64, 28,860.16 and 12,955.52 is: 17,879.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.64 : 28,860.16 = 12,955.52 : x
  2. Step 2: Convert to fraction form
    20,912.64/28,860.16 = 12,955.52/x
  3. Step 3: Cross multiply
    20,912.64x = 28,860.16 × 12,955.52
  4. Step 4: Simplify right side
    20,912.64x = 373,898,380.08
  5. Step 5: Solve for x
    x = 373,898,380.08/20,912.64
  6. Step 6: Final answer
    x = 17,879.06

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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.