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Finding the Fourth Proportional to 979.85, 1,469.78 and 922.80

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Solution

The fourth proportional to 979.85, 1,469.78 and 922.80 is: 1,384.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.85 : 1,469.78 = 922.80 : x
  2. Step 2: Convert to fraction form
    979.85/1,469.78 = 922.80/x
  3. Step 3: Cross multiply
    979.85x = 1,469.78 × 922.80
  4. Step 4: Simplify right side
    979.85x = 1,356,308.37
  5. Step 5: Solve for x
    x = 1,356,308.37/979.85
  6. Step 6: Final answer
    x = 1,384.21

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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.