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Finding the Fourth Proportional to 979.83, 1,469.75 and 492.21

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Solution

The fourth proportional to 979.83, 1,469.75 and 492.21 is: 738.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.83 : 1,469.75 = 492.21 : x
  2. Step 2: Convert to fraction form
    979.83/1,469.75 = 492.21/x
  3. Step 3: Cross multiply
    979.83x = 1,469.75 × 492.21
  4. Step 4: Simplify right side
    979.83x = 723,423.19
  5. Step 5: Solve for x
    x = 723,423.19/979.83
  6. Step 6: Final answer
    x = 738.32

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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.