Home / 31,690.07-43,761.93-20,379.21

Finding the Fourth Proportional to 31,690.07, 43,761.93 and 20,379.21

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Solution

The fourth proportional to 31,690.07, 43,761.93 and 20,379.21 is: 28,142.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,690.07 : 43,761.93 = 20,379.21 : x
  2. Step 2: Convert to fraction form
    31,690.07/43,761.93 = 20,379.21/x
  3. Step 3: Cross multiply
    31,690.07x = 43,761.93 × 20,379.21
  4. Step 4: Simplify right side
    31,690.07x = 891,833,371.89
  5. Step 5: Solve for x
    x = 891,833,371.89/31,690.07
  6. Step 6: Final answer
    x = 28,142.36

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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.