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Finding the Fourth Proportional to 388.05, 581.81 and 214.80

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Solution

The fourth proportional to 388.05, 581.81 and 214.80 is: 322.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.05 : 581.81 = 214.80 : x
  2. Step 2: Convert to fraction form
    388.05/581.81 = 214.80/x
  3. Step 3: Cross multiply
    388.05x = 581.81 × 214.80
  4. Step 4: Simplify right side
    388.05x = 124,972.79
  5. Step 5: Solve for x
    x = 124,972.79/388.05
  6. Step 6: Final answer
    x = 322.05

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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.