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Finding the Fourth Proportional to 387.73, 580.88 and 346.21

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Solution

The fourth proportional to 387.73, 580.88 and 346.21 is: 518.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.73 : 580.88 = 346.21 : x
  2. Step 2: Convert to fraction form
    387.73/580.88 = 346.21/x
  3. Step 3: Cross multiply
    387.73x = 580.88 × 346.21
  4. Step 4: Simplify right side
    387.73x = 201,106.20
  5. Step 5: Solve for x
    x = 201,106.20/387.73
  6. Step 6: Final answer
    x = 518.68

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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.