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Finding the Fourth Proportional to 617.19, 852.84 and 491.55

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Solution

The fourth proportional to 617.19, 852.84 and 491.55 is: 679.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.19 : 852.84 = 491.55 : x
  2. Step 2: Convert to fraction form
    617.19/852.84 = 491.55/x
  3. Step 3: Cross multiply
    617.19x = 852.84 × 491.55
  4. Step 4: Simplify right side
    617.19x = 419,213.50
  5. Step 5: Solve for x
    x = 419,213.50/617.19
  6. Step 6: Final answer
    x = 679.23

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.