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Finding the Fourth Proportional to 7,811.20, 10,773.60 and 5,015.20

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Solution

The fourth proportional to 7,811.20, 10,773.60 and 5,015.20 is: 6,917.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,811.20 : 10,773.60 = 5,015.20 : x
  2. Step 2: Convert to fraction form
    7,811.20/10,773.60 = 5,015.20/x
  3. Step 3: Cross multiply
    7,811.20x = 10,773.60 × 5,015.20
  4. Step 4: Simplify right side
    7,811.20x = 54,031,758.72
  5. Step 5: Solve for x
    x = 54,031,758.72/7,811.20
  6. Step 6: Final answer
    x = 6,917.22

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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.