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Finding the Fourth Proportional to 516.02, 711.84 and 391.46

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Solution

The fourth proportional to 516.02, 711.84 and 391.46 is: 540.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.02 : 711.84 = 391.46 : x
  2. Step 2: Convert to fraction form
    516.02/711.84 = 391.46/x
  3. Step 3: Cross multiply
    516.02x = 711.84 × 391.46
  4. Step 4: Simplify right side
    516.02x = 278,656.89
  5. Step 5: Solve for x
    x = 278,656.89/516.02
  6. Step 6: Final answer
    x = 540.01

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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.