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Finding the Fourth Proportional to 39,445.31, 59,185.31 and 20,721

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Solution

The fourth proportional to 39,445.31, 59,185.31 and 20,721 is: 31,090.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,445.31 : 59,185.31 = 20,721 : x
  2. Step 2: Convert to fraction form
    39,445.31/59,185.31 = 20,721/x
  3. Step 3: Cross multiply
    39,445.31x = 59,185.31 × 20,721
  4. Step 4: Simplify right side
    39,445.31x = 1,226,378,704.91
  5. Step 5: Solve for x
    x = 1,226,378,704.91/39,445.31
  6. Step 6: Final answer
    x = 31,090.61

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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.