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Finding the Fourth Proportional to 709.23, 978.72 and 414.42

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Solution

The fourth proportional to 709.23, 978.72 and 414.42 is: 571.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.23 : 978.72 = 414.42 : x
  2. Step 2: Convert to fraction form
    709.23/978.72 = 414.42/x
  3. Step 3: Cross multiply
    709.23x = 978.72 × 414.42
  4. Step 4: Simplify right side
    709.23x = 405,601.14
  5. Step 5: Solve for x
    x = 405,601.14/709.23
  6. Step 6: Final answer
    x = 571.89

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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.