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Finding the Fourth Proportional to 20,693.40, 31,040.10 and 16,999.80

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Solution

The fourth proportional to 20,693.40, 31,040.10 and 16,999.80 is: 25,499.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,693.40 : 31,040.10 = 16,999.80 : x
  2. Step 2: Convert to fraction form
    20,693.40/31,040.10 = 16,999.80/x
  3. Step 3: Cross multiply
    20,693.40x = 31,040.10 × 16,999.80
  4. Step 4: Simplify right side
    20,693.40x = 527,675,491.98
  5. Step 5: Solve for x
    x = 527,675,491.98/20,693.40
  6. Step 6: Final answer
    x = 25,499.70

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Similar ratio
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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.