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Finding the Fourth Proportional to 389.74, 584.40 and 345.33

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Solution

The fourth proportional to 389.74, 584.40 and 345.33 is: 517.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.74 : 584.40 = 345.33 : x
  2. Step 2: Convert to fraction form
    389.74/584.40 = 345.33/x
  3. Step 3: Cross multiply
    389.74x = 584.40 × 345.33
  4. Step 4: Simplify right side
    389.74x = 201,810.10
  5. Step 5: Solve for x
    x = 201,810.10/389.74
  6. Step 6: Final answer
    x = 517.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.