Home / 31,739.09-43,777.19-20,971.49

Finding the Fourth Proportional to 31,739.09, 43,777.19 and 20,971.49

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Solution

The fourth proportional to 31,739.09, 43,777.19 and 20,971.49 is: 28,925.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,739.09 : 43,777.19 = 20,971.49 : x
  2. Step 2: Convert to fraction form
    31,739.09/43,777.19 = 20,971.49/x
  3. Step 3: Cross multiply
    31,739.09x = 43,777.19 × 20,971.49
  4. Step 4: Simplify right side
    31,739.09x = 918,072,735.86
  5. Step 5: Solve for x
    x = 918,072,735.86/31,739.09
  6. Step 6: Final answer
    x = 28,925.62

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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.