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Finding the Fourth Proportional to 979.78, 1,349.97 and 730.99

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Solution

The fourth proportional to 979.78, 1,349.97 and 730.99 is: 1,007.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.78 : 1,349.97 = 730.99 : x
  2. Step 2: Convert to fraction form
    979.78/1,349.97 = 730.99/x
  3. Step 3: Cross multiply
    979.78x = 1,349.97 × 730.99
  4. Step 4: Simplify right side
    979.78x = 986,814.57
  5. Step 5: Solve for x
    x = 986,814.57/979.78
  6. Step 6: Final answer
    x = 1,007.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.