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Finding the Fourth Proportional to 521.20, 720.10 and 516.08

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Solution

The fourth proportional to 521.20, 720.10 and 516.08 is: 713.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.20 : 720.10 = 516.08 : x
  2. Step 2: Convert to fraction form
    521.20/720.10 = 516.08/x
  3. Step 3: Cross multiply
    521.20x = 720.10 × 516.08
  4. Step 4: Simplify right side
    521.20x = 371,629.21
  5. Step 5: Solve for x
    x = 371,629.21/521.20
  6. Step 6: Final answer
    x = 713.03

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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.