Home / 13,211.20-18,231.16-7,242.72

Finding the Fourth Proportional to 13,211.20, 18,231.16 and 7,242.72

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Solution

The fourth proportional to 13,211.20, 18,231.16 and 7,242.72 is: 9,994.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,211.20 : 18,231.16 = 7,242.72 : x
  2. Step 2: Convert to fraction form
    13,211.20/18,231.16 = 7,242.72/x
  3. Step 3: Cross multiply
    13,211.20x = 18,231.16 × 7,242.72
  4. Step 4: Simplify right side
    13,211.20x = 132,043,187.16
  5. Step 5: Solve for x
    x = 132,043,187.16/13,211.20
  6. Step 6: Final answer
    x = 9,994.79

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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.