Home / 31,144.31-42,964.20-20,384.45

Finding the Fourth Proportional to 31,144.31, 42,964.20 and 20,384.45

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Solution

The fourth proportional to 31,144.31, 42,964.20 and 20,384.45 is: 28,120.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,144.31 : 42,964.20 = 20,384.45 : x
  2. Step 2: Convert to fraction form
    31,144.31/42,964.20 = 20,384.45/x
  3. Step 3: Cross multiply
    31,144.31x = 42,964.20 × 20,384.45
  4. Step 4: Simplify right side
    31,144.31x = 875,801,511.55
  5. Step 5: Solve for x
    x = 875,801,511.55/31,144.31
  6. Step 6: Final answer
    x = 28,120.75

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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.