Home / 31,396.32-47,034.72-18,720

Finding the Fourth Proportional to 31,396.32, 47,034.72 and 18,720

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Solution

The fourth proportional to 31,396.32, 47,034.72 and 18,720 is: 28,044.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,396.32 : 47,034.72 = 18,720 : x
  2. Step 2: Convert to fraction form
    31,396.32/47,034.72 = 18,720/x
  3. Step 3: Cross multiply
    31,396.32x = 47,034.72 × 18,720
  4. Step 4: Simplify right side
    31,396.32x = 880,489,958.40
  5. Step 5: Solve for x
    x = 880,489,958.40/31,396.32
  6. Step 6: Final answer
    x = 28,044.37

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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.