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Finding the Fourth Proportional to 929.62, 1,393.82 and 518.80

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Solution

The fourth proportional to 929.62, 1,393.82 and 518.80 is: 777.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.62 : 1,393.82 = 518.80 : x
  2. Step 2: Convert to fraction form
    929.62/1,393.82 = 518.80/x
  3. Step 3: Cross multiply
    929.62x = 1,393.82 × 518.80
  4. Step 4: Simplify right side
    929.62x = 723,107.74
  5. Step 5: Solve for x
    x = 723,107.74/929.62
  6. Step 6: Final answer
    x = 777.86

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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.