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Finding the Fourth Proportional to 7,218.68, 9,961.14 and 4,031.72

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Solution

The fourth proportional to 7,218.68, 9,961.14 and 4,031.72 is: 5,563.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,218.68 : 9,961.14 = 4,031.72 : x
  2. Step 2: Convert to fraction form
    7,218.68/9,961.14 = 4,031.72/x
  3. Step 3: Cross multiply
    7,218.68x = 9,961.14 × 4,031.72
  4. Step 4: Simplify right side
    7,218.68x = 40,160,527.36
  5. Step 5: Solve for x
    x = 40,160,527.36/7,218.68
  6. Step 6: Final answer
    x = 5,563.42

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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.