Home / 21,878.38-30,161.48-15,485.96

Finding the Fourth Proportional to 21,878.38, 30,161.48 and 15,485.96

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Solution

The fourth proportional to 21,878.38, 30,161.48 and 15,485.96 is: 21,348.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,878.38 : 30,161.48 = 15,485.96 : x
  2. Step 2: Convert to fraction form
    21,878.38/30,161.48 = 15,485.96/x
  3. Step 3: Cross multiply
    21,878.38x = 30,161.48 × 15,485.96
  4. Step 4: Simplify right side
    21,878.38x = 467,079,472.82
  5. Step 5: Solve for x
    x = 467,079,472.82/21,878.38
  6. Step 6: Final answer
    x = 21,348.91

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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.