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Finding the Fourth Proportional to 394.74, 587.93 and 389.93

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Solution

The fourth proportional to 394.74, 587.93 and 389.93 is: 580.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.74 : 587.93 = 389.93 : x
  2. Step 2: Convert to fraction form
    394.74/587.93 = 389.93/x
  3. Step 3: Cross multiply
    394.74x = 587.93 × 389.93
  4. Step 4: Simplify right side
    394.74x = 229,246.66
  5. Step 5: Solve for x
    x = 229,246.66/394.74
  6. Step 6: Final answer
    x = 580.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.