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Finding the Fourth Proportional to 388.58, 581.57 and 383.39

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Solution

The fourth proportional to 388.58, 581.57 and 383.39 is: 573.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.58 : 581.57 = 383.39 : x
  2. Step 2: Convert to fraction form
    388.58/581.57 = 383.39/x
  3. Step 3: Cross multiply
    388.58x = 581.57 × 383.39
  4. Step 4: Simplify right side
    388.58x = 222,970.53
  5. Step 5: Solve for x
    x = 222,970.53/388.58
  6. Step 6: Final answer
    x = 573.80

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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.