Home / 21,038.92-31,581.12-18,713.81

Finding the Fourth Proportional to 21,038.92, 31,581.12 and 18,713.81

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Solution

The fourth proportional to 21,038.92, 31,581.12 and 18,713.81 is: 28,090.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,038.92 : 31,581.12 = 18,713.81 : x
  2. Step 2: Convert to fraction form
    21,038.92/31,581.12 = 18,713.81/x
  3. Step 3: Cross multiply
    21,038.92x = 31,581.12 × 18,713.81
  4. Step 4: Simplify right side
    21,038.92x = 591,003,079.27
  5. Step 5: Solve for x
    x = 591,003,079.27/21,038.92
  6. Step 6: Final answer
    x = 28,090.94

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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.