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Finding the Fourth Proportional to 387.83, 584.39 and 320.85

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Solution

The fourth proportional to 387.83, 584.39 and 320.85 is: 483.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.83 : 584.39 = 320.85 : x
  2. Step 2: Convert to fraction form
    387.83/584.39 = 320.85/x
  3. Step 3: Cross multiply
    387.83x = 584.39 × 320.85
  4. Step 4: Simplify right side
    387.83x = 187,499.93
  5. Step 5: Solve for x
    x = 187,499.93/387.83
  6. Step 6: Final answer
    x = 483.47

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.