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Finding the Fourth Proportional to 611.75, 917.21 and 395.21

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Solution

The fourth proportional to 611.75, 917.21 and 395.21 is: 592.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.75 : 917.21 = 395.21 : x
  2. Step 2: Convert to fraction form
    611.75/917.21 = 395.21/x
  3. Step 3: Cross multiply
    611.75x = 917.21 × 395.21
  4. Step 4: Simplify right side
    611.75x = 362,490.56
  5. Step 5: Solve for x
    x = 362,490.56/611.75
  6. Step 6: Final answer
    x = 592.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.