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Finding the Fourth Proportional to 388.65, 579.24 and 385.43

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Solution

The fourth proportional to 388.65, 579.24 and 385.43 is: 574.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.65 : 579.24 = 385.43 : x
  2. Step 2: Convert to fraction form
    388.65/579.24 = 385.43/x
  3. Step 3: Cross multiply
    388.65x = 579.24 × 385.43
  4. Step 4: Simplify right side
    388.65x = 223,257.31
  5. Step 5: Solve for x
    x = 223,257.31/388.65
  6. Step 6: Final answer
    x = 574.45

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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.