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Finding the Fourth Proportional to 13,315.67, 18,375.72 and 7,347.55

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Solution

The fourth proportional to 13,315.67, 18,375.72 and 7,347.55 is: 10,139.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,315.67 : 18,375.72 = 7,347.55 : x
  2. Step 2: Convert to fraction form
    13,315.67/18,375.72 = 7,347.55/x
  3. Step 3: Cross multiply
    13,315.67x = 18,375.72 × 7,347.55
  4. Step 4: Simplify right side
    13,315.67x = 135,016,508.27
  5. Step 5: Solve for x
    x = 135,016,508.27/13,315.67
  6. Step 6: Final answer
    x = 10,139.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.