Home / 20,966.20-28,947.18-13,020.28

Finding the Fourth Proportional to 20,966.20, 28,947.18 and 13,020.28

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Solution

The fourth proportional to 20,966.20, 28,947.18 and 13,020.28 is: 17,976.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,966.20 : 28,947.18 = 13,020.28 : x
  2. Step 2: Convert to fraction form
    20,966.20/28,947.18 = 13,020.28/x
  3. Step 3: Cross multiply
    20,966.20x = 28,947.18 × 13,020.28
  4. Step 4: Simplify right side
    20,966.20x = 376,900,388.81
  5. Step 5: Solve for x
    x = 376,900,388.81/20,966.20
  6. Step 6: Final answer
    x = 17,976.57

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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.