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Finding the Fourth Proportional to 709.09, 978.40 and 414.30

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Solution

The fourth proportional to 709.09, 978.40 and 414.30 is: 571.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.09 : 978.40 = 414.30 : x
  2. Step 2: Convert to fraction form
    709.09/978.40 = 414.30/x
  3. Step 3: Cross multiply
    709.09x = 978.40 × 414.30
  4. Step 4: Simplify right side
    709.09x = 405,352.56
  5. Step 5: Solve for x
    x = 405,352.56/709.09
  6. Step 6: Final answer
    x = 571.65

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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.