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Finding the Fourth Proportional to 71,315.55, 106,965.09 and 18,729.15

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Solution

The fourth proportional to 71,315.55, 106,965.09 and 18,729.15 is: 28,091.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,315.55 : 106,965.09 = 18,729.15 : x
  2. Step 2: Convert to fraction form
    71,315.55/106,965.09 = 18,729.15/x
  3. Step 3: Cross multiply
    71,315.55x = 106,965.09 × 18,729.15
  4. Step 4: Simplify right side
    71,315.55x = 2,003,365,215.37
  5. Step 5: Solve for x
    x = 2,003,365,215.37/71,315.55
  6. Step 6: Final answer
    x = 28,091.56

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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.