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Finding the Fourth Proportional to 387.63, 581.65 and 214.44

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Solution

The fourth proportional to 387.63, 581.65 and 214.44 is: 321.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.63 : 581.65 = 214.44 : x
  2. Step 2: Convert to fraction form
    387.63/581.65 = 214.44/x
  3. Step 3: Cross multiply
    387.63x = 581.65 × 214.44
  4. Step 4: Simplify right side
    387.63x = 124,726.31
  5. Step 5: Solve for x
    x = 124,726.31/387.63
  6. Step 6: Final answer
    x = 321.77

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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.