Home / 21,115.38-31,680.70-9,880.62

Finding the Fourth Proportional to 21,115.38, 31,680.70 and 9,880.62

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Solution

The fourth proportional to 21,115.38, 31,680.70 and 9,880.62 is: 14,824.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.38 : 31,680.70 = 9,880.62 : x
  2. Step 2: Convert to fraction form
    21,115.38/31,680.70 = 9,880.62/x
  3. Step 3: Cross multiply
    21,115.38x = 31,680.70 × 9,880.62
  4. Step 4: Simplify right side
    21,115.38x = 313,024,958.03
  5. Step 5: Solve for x
    x = 313,024,958.03/21,115.38
  6. Step 6: Final answer
    x = 14,824.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.