Home / 20,378.89-28,116.72-12,832.70

Finding the Fourth Proportional to 20,378.89, 28,116.72 and 12,832.70

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Solution

The fourth proportional to 20,378.89, 28,116.72 and 12,832.70 is: 17,705.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.89 : 28,116.72 = 12,832.70 : x
  2. Step 2: Convert to fraction form
    20,378.89/28,116.72 = 12,832.70/x
  3. Step 3: Cross multiply
    20,378.89x = 28,116.72 × 12,832.70
  4. Step 4: Simplify right side
    20,378.89x = 360,813,292.16
  5. Step 5: Solve for x
    x = 360,813,292.16/20,378.89
  6. Step 6: Final answer
    x = 17,705.25

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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.