Home / 31,415.87-43,376.83-21,839.78

Finding the Fourth Proportional to 31,415.87, 43,376.83 and 21,839.78

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Solution

The fourth proportional to 31,415.87, 43,376.83 and 21,839.78 is: 30,154.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,415.87 : 43,376.83 = 21,839.78 : x
  2. Step 2: Convert to fraction form
    31,415.87/43,376.83 = 21,839.78/x
  3. Step 3: Cross multiply
    31,415.87x = 43,376.83 × 21,839.78
  4. Step 4: Simplify right side
    31,415.87x = 947,340,207.41
  5. Step 5: Solve for x
    x = 947,340,207.41/31,415.87
  6. Step 6: Final answer
    x = 30,154.83

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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.