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Finding the Fourth Proportional to 387.98, 581.73 and 258.05

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Solution

The fourth proportional to 387.98, 581.73 and 258.05 is: 386.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.98 : 581.73 = 258.05 : x
  2. Step 2: Convert to fraction form
    387.98/581.73 = 258.05/x
  3. Step 3: Cross multiply
    387.98x = 581.73 × 258.05
  4. Step 4: Simplify right side
    387.98x = 150,115.43
  5. Step 5: Solve for x
    x = 150,115.43/387.98
  6. Step 6: Final answer
    x = 386.92

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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.