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Finding the Fourth Proportional to 611.85, 844.15 and 390.93

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Solution

The fourth proportional to 611.85, 844.15 and 390.93 is: 539.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.85 : 844.15 = 390.93 : x
  2. Step 2: Convert to fraction form
    611.85/844.15 = 390.93/x
  3. Step 3: Cross multiply
    611.85x = 844.15 × 390.93
  4. Step 4: Simplify right side
    611.85x = 330,002.58
  5. Step 5: Solve for x
    x = 330,002.58/611.85
  6. Step 6: Final answer
    x = 539.35

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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.