Home / 20,903.19-31,355.82-8,421.54

Finding the Fourth Proportional to 20,903.19, 31,355.82 and 8,421.54

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Solution

The fourth proportional to 20,903.19, 31,355.82 and 8,421.54 is: 12,632.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,903.19 : 31,355.82 = 8,421.54 : x
  2. Step 2: Convert to fraction form
    20,903.19/31,355.82 = 8,421.54/x
  3. Step 3: Cross multiply
    20,903.19x = 31,355.82 × 8,421.54
  4. Step 4: Simplify right side
    20,903.19x = 264,064,292.36
  5. Step 5: Solve for x
    x = 264,064,292.36/20,903.19
  6. Step 6: Final answer
    x = 12,632.73

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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.