Home / 30,390.89-41,889.22-20,315.66

Finding the Fourth Proportional to 30,390.89, 41,889.22 and 20,315.66

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Solution

The fourth proportional to 30,390.89, 41,889.22 and 20,315.66 is: 28,002.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,390.89 : 41,889.22 = 20,315.66 : x
  2. Step 2: Convert to fraction form
    30,390.89/41,889.22 = 20,315.66/x
  3. Step 3: Cross multiply
    30,390.89x = 41,889.22 × 20,315.66
  4. Step 4: Simplify right side
    30,390.89x = 851,006,890.95
  5. Step 5: Solve for x
    x = 851,006,890.95/30,390.89
  6. Step 6: Final answer
    x = 28,002.04

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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.