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Finding the Fourth Proportional to 993.91, 1,491.84 and 500.65

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Solution

The fourth proportional to 993.91, 1,491.84 and 500.65 is: 751.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.91 : 1,491.84 = 500.65 : x
  2. Step 2: Convert to fraction form
    993.91/1,491.84 = 500.65/x
  3. Step 3: Cross multiply
    993.91x = 1,491.84 × 500.65
  4. Step 4: Simplify right side
    993.91x = 746,889.70
  5. Step 5: Solve for x
    x = 746,889.70/993.91
  6. Step 6: Final answer
    x = 751.47

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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.