Home / 20,885.36-31,335.93-12,571.25

Finding the Fourth Proportional to 20,885.36, 31,335.93 and 12,571.25

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Solution

The fourth proportional to 20,885.36, 31,335.93 and 12,571.25 is: 18,861.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.36 : 31,335.93 = 12,571.25 : x
  2. Step 2: Convert to fraction form
    20,885.36/31,335.93 = 12,571.25/x
  3. Step 3: Cross multiply
    20,885.36x = 31,335.93 × 12,571.25
  4. Step 4: Simplify right side
    20,885.36x = 393,931,653.33
  5. Step 5: Solve for x
    x = 393,931,653.33/20,885.36
  6. Step 6: Final answer
    x = 18,861.62

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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.