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Finding the Fourth Proportional to 709.50, 978.79 and 414.63

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Solution

The fourth proportional to 709.50, 978.79 and 414.63 is: 572.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.50 : 978.79 = 414.63 : x
  2. Step 2: Convert to fraction form
    709.50/978.79 = 414.63/x
  3. Step 3: Cross multiply
    709.50x = 978.79 × 414.63
  4. Step 4: Simplify right side
    709.50x = 405,838.33
  5. Step 5: Solve for x
    x = 405,838.33/709.50
  6. Step 6: Final answer
    x = 572.01

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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.