Home / 31,078.35-42,874.46-21,003.12

Finding the Fourth Proportional to 31,078.35, 42,874.46 and 21,003.12

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Solution

The fourth proportional to 31,078.35, 42,874.46 and 21,003.12 is: 28,975.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,078.35 : 42,874.46 = 21,003.12 : x
  2. Step 2: Convert to fraction form
    31,078.35/42,874.46 = 21,003.12/x
  3. Step 3: Cross multiply
    31,078.35x = 42,874.46 × 21,003.12
  4. Step 4: Simplify right side
    31,078.35x = 900,497,108.93
  5. Step 5: Solve for x
    x = 900,497,108.93/31,078.35
  6. Step 6: Final answer
    x = 28,975.07

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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.