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Finding the Fourth Proportional to 388, 581.47 and 214.42

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Solution

The fourth proportional to 388, 581.47 and 214.42 is: 321.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    388 : 581.47 = 214.42 : x
  2. Step 2: Convert to fraction form
    388/581.47 = 214.42/x
  3. Step 3: Cross multiply
    388x = 581.47 × 214.42
  4. Step 4: Simplify right side
    388x = 124,678.80
  5. Step 5: Solve for x
    x = 124,678.80/388
  6. Step 6: Final answer
    x = 321.34

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.