Home / 20,817.36-31,195.08-12,487.59

Finding the Fourth Proportional to 20,817.36, 31,195.08 and 12,487.59

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Solution

The fourth proportional to 20,817.36, 31,195.08 and 12,487.59 is: 18,712.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.36 : 31,195.08 = 12,487.59 : x
  2. Step 2: Convert to fraction form
    20,817.36/31,195.08 = 12,487.59/x
  3. Step 3: Cross multiply
    20,817.36x = 31,195.08 × 12,487.59
  4. Step 4: Simplify right side
    20,817.36x = 389,551,369.06
  5. Step 5: Solve for x
    x = 389,551,369.06/20,817.36
  6. Step 6: Final answer
    x = 18,712.81

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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.