Home / 21,187.89-31,781.72-5,177.23

Finding the Fourth Proportional to 21,187.89, 31,781.72 and 5,177.23

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Solution

The fourth proportional to 21,187.89, 31,781.72 and 5,177.23 is: 7,765.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.89 : 31,781.72 = 5,177.23 : x
  2. Step 2: Convert to fraction form
    21,187.89/31,781.72 = 5,177.23/x
  3. Step 3: Cross multiply
    21,187.89x = 31,781.72 × 5,177.23
  4. Step 4: Simplify right side
    21,187.89x = 164,541,207.72
  5. Step 5: Solve for x
    x = 164,541,207.72/21,187.89
  6. Step 6: Final answer
    x = 7,765.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.