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Finding the Fourth Proportional to 709.02, 978.45 and 414.21

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Solution

The fourth proportional to 709.02, 978.45 and 414.21 is: 571.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.02 : 978.45 = 414.21 : x
  2. Step 2: Convert to fraction form
    709.02/978.45 = 414.21/x
  3. Step 3: Cross multiply
    709.02x = 978.45 × 414.21
  4. Step 4: Simplify right side
    709.02x = 405,283.77
  5. Step 5: Solve for x
    x = 405,283.77/709.02
  6. Step 6: Final answer
    x = 571.61

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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.