Home / 20,749.43-31,124.01-12,431.81

Finding the Fourth Proportional to 20,749.43, 31,124.01 and 12,431.81

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Solution

The fourth proportional to 20,749.43, 31,124.01 and 12,431.81 is: 18,647.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,749.43 : 31,124.01 = 12,431.81 : x
  2. Step 2: Convert to fraction form
    20,749.43/31,124.01 = 12,431.81/x
  3. Step 3: Cross multiply
    20,749.43x = 31,124.01 × 12,431.81
  4. Step 4: Simplify right side
    20,749.43x = 386,927,778.76
  5. Step 5: Solve for x
    x = 386,927,778.76/20,749.43
  6. Step 6: Final answer
    x = 18,647.63

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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.