Home / 20,981.97-28,955.21-11,550.87

Finding the Fourth Proportional to 20,981.97, 28,955.21 and 11,550.87

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Solution

The fourth proportional to 20,981.97, 28,955.21 and 11,550.87 is: 15,940.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.97 : 28,955.21 = 11,550.87 : x
  2. Step 2: Convert to fraction form
    20,981.97/28,955.21 = 11,550.87/x
  3. Step 3: Cross multiply
    20,981.97x = 28,955.21 × 11,550.87
  4. Step 4: Simplify right side
    20,981.97x = 334,457,808.78
  5. Step 5: Solve for x
    x = 334,457,808.78/20,981.97
  6. Step 6: Final answer
    x = 15,940.25

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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.