Home / 31,032.96-42,781.44-20,818.56

Finding the Fourth Proportional to 31,032.96, 42,781.44 and 20,818.56

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Solution

The fourth proportional to 31,032.96, 42,781.44 and 20,818.56 is: 28,700.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,032.96 : 42,781.44 = 20,818.56 : x
  2. Step 2: Convert to fraction form
    31,032.96/42,781.44 = 20,818.56/x
  3. Step 3: Cross multiply
    31,032.96x = 42,781.44 × 20,818.56
  4. Step 4: Simplify right side
    31,032.96x = 890,647,975.53
  5. Step 5: Solve for x
    x = 890,647,975.53/31,032.96
  6. Step 6: Final answer
    x = 28,700.07

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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.