Home / 20,992.15-28,970.49-11,560.72

Finding the Fourth Proportional to 20,992.15, 28,970.49 and 11,560.72

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Solution

The fourth proportional to 20,992.15, 28,970.49 and 11,560.72 is: 15,954.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.15 : 28,970.49 = 11,560.72 : x
  2. Step 2: Convert to fraction form
    20,992.15/28,970.49 = 11,560.72/x
  3. Step 3: Cross multiply
    20,992.15x = 28,970.49 × 11,560.72
  4. Step 4: Simplify right side
    20,992.15x = 334,919,723.15
  5. Step 5: Solve for x
    x = 334,919,723.15/20,992.15
  6. Step 6: Final answer
    x = 15,954.52

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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.