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Finding the Fourth Proportional to 989.85, 1,484.78 and 850.65

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Solution

The fourth proportional to 989.85, 1,484.78 and 850.65 is: 1,275.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.85 : 1,484.78 = 850.65 : x
  2. Step 2: Convert to fraction form
    989.85/1,484.78 = 850.65/x
  3. Step 3: Cross multiply
    989.85x = 1,484.78 × 850.65
  4. Step 4: Simplify right side
    989.85x = 1,263,023.85
  5. Step 5: Solve for x
    x = 1,263,023.85/989.85
  6. Step 6: Final answer
    x = 1,275.98

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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.