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Finding the Fourth Proportional to 387.61, 580.86 and 214.35

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Solution

The fourth proportional to 387.61, 580.86 and 214.35 is: 321.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.61 : 580.86 = 214.35 : x
  2. Step 2: Convert to fraction form
    387.61/580.86 = 214.35/x
  3. Step 3: Cross multiply
    387.61x = 580.86 × 214.35
  4. Step 4: Simplify right side
    387.61x = 124,508.43
  5. Step 5: Solve for x
    x = 124,508.43/387.61
  6. Step 6: Final answer
    x = 321.22

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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.