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Finding the Fourth Proportional to 656.42, 984.72 and 519.72

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Solution

The fourth proportional to 656.42, 984.72 and 519.72 is: 779.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.42 : 984.72 = 519.72 : x
  2. Step 2: Convert to fraction form
    656.42/984.72 = 519.72/x
  3. Step 3: Cross multiply
    656.42x = 984.72 × 519.72
  4. Step 4: Simplify right side
    656.42x = 511,778.68
  5. Step 5: Solve for x
    x = 511,778.68/656.42
  6. Step 6: Final answer
    x = 779.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.