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Finding the Fourth Proportional to 709.94, 979.87 and 447.91

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Solution

The fourth proportional to 709.94, 979.87 and 447.91 is: 618.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.94 : 979.87 = 447.91 : x
  2. Step 2: Convert to fraction form
    709.94/979.87 = 447.91/x
  3. Step 3: Cross multiply
    709.94x = 979.87 × 447.91
  4. Step 4: Simplify right side
    709.94x = 438,890.00
  5. Step 5: Solve for x
    x = 438,890.00/709.94
  6. Step 6: Final answer
    x = 618.20

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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.