Home / 20,720.72-31,108.17-12,302.59

Finding the Fourth Proportional to 20,720.72, 31,108.17 and 12,302.59

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Solution

The fourth proportional to 20,720.72, 31,108.17 and 12,302.59 is: 18,469.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.72 : 31,108.17 = 12,302.59 : x
  2. Step 2: Convert to fraction form
    20,720.72/31,108.17 = 12,302.59/x
  3. Step 3: Cross multiply
    20,720.72x = 31,108.17 × 12,302.59
  4. Step 4: Simplify right side
    20,720.72x = 382,710,905.62
  5. Step 5: Solve for x
    x = 382,710,905.62/20,720.72
  6. Step 6: Final answer
    x = 18,469.97

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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.