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Finding the Fourth Proportional to 13,790.01, 20,672.05 and 7,220.51

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Solution

The fourth proportional to 13,790.01, 20,672.05 and 7,220.51 is: 10,823.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,790.01 : 20,672.05 = 7,220.51 : x
  2. Step 2: Convert to fraction form
    13,790.01/20,672.05 = 7,220.51/x
  3. Step 3: Cross multiply
    13,790.01x = 20,672.05 × 7,220.51
  4. Step 4: Simplify right side
    13,790.01x = 149,262,743.75
  5. Step 5: Solve for x
    x = 149,262,743.75/13,790.01
  6. Step 6: Final answer
    x = 10,823.98

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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.