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Finding the Fourth Proportional to 611.94, 844.08 and 390.84

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Solution

The fourth proportional to 611.94, 844.08 and 390.84 is: 539.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.94 : 844.08 = 390.84 : x
  2. Step 2: Convert to fraction form
    611.94/844.08 = 390.84/x
  3. Step 3: Cross multiply
    611.94x = 844.08 × 390.84
  4. Step 4: Simplify right side
    611.94x = 329,900.23
  5. Step 5: Solve for x
    x = 329,900.23/611.94
  6. Step 6: Final answer
    x = 539.11

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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.