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Finding the Fourth Proportional to 388.60, 580.21 and 384.71

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Solution

The fourth proportional to 388.60, 580.21 and 384.71 is: 574.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.60 : 580.21 = 384.71 : x
  2. Step 2: Convert to fraction form
    388.60/580.21 = 384.71/x
  3. Step 3: Cross multiply
    388.60x = 580.21 × 384.71
  4. Step 4: Simplify right side
    388.60x = 223,208.73
  5. Step 5: Solve for x
    x = 223,208.73/388.60
  6. Step 6: Final answer
    x = 574.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.