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Finding the Fourth Proportional to 657.21, 907.20 and 516.99

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Solution

The fourth proportional to 657.21, 907.20 and 516.99 is: 713.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.21 : 907.20 = 516.99 : x
  2. Step 2: Convert to fraction form
    657.21/907.20 = 516.99/x
  3. Step 3: Cross multiply
    657.21x = 907.20 × 516.99
  4. Step 4: Simplify right side
    657.21x = 469,013.33
  5. Step 5: Solve for x
    x = 469,013.33/657.21
  6. Step 6: Final answer
    x = 713.64

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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.