Home / 31,102.85-42,921.27-18,999.15

Finding the Fourth Proportional to 31,102.85, 42,921.27 and 18,999.15

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Solution

The fourth proportional to 31,102.85, 42,921.27 and 18,999.15 is: 26,218.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,102.85 : 42,921.27 = 18,999.15 : x
  2. Step 2: Convert to fraction form
    31,102.85/42,921.27 = 18,999.15/x
  3. Step 3: Cross multiply
    31,102.85x = 42,921.27 × 18,999.15
  4. Step 4: Simplify right side
    31,102.85x = 815,467,646.92
  5. Step 5: Solve for x
    x = 815,467,646.92/31,102.85
  6. Step 6: Final answer
    x = 26,218.43

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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.