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Finding the Fourth Proportional to 709.35, 978.64 and 447.31

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Solution

The fourth proportional to 709.35, 978.64 and 447.31 is: 617.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.35 : 978.64 = 447.31 : x
  2. Step 2: Convert to fraction form
    709.35/978.64 = 447.31/x
  3. Step 3: Cross multiply
    709.35x = 978.64 × 447.31
  4. Step 4: Simplify right side
    709.35x = 437,755.46
  5. Step 5: Solve for x
    x = 437,755.46/709.35
  6. Step 6: Final answer
    x = 617.12

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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.