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Finding the Fourth Proportional to 611.85, 844.00 and 390.55

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Solution

The fourth proportional to 611.85, 844.00 and 390.55 is: 538.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.85 : 844.00 = 390.55 : x
  2. Step 2: Convert to fraction form
    611.85/844.00 = 390.55/x
  3. Step 3: Cross multiply
    611.85x = 844.00 × 390.55
  4. Step 4: Simplify right side
    611.85x = 329,621.96
  5. Step 5: Solve for x
    x = 329,621.96/611.85
  6. Step 6: Final answer
    x = 538.73

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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.