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Finding the Fourth Proportional to 388.84, 578.41 and 384.92

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Solution

The fourth proportional to 388.84, 578.41 and 384.92 is: 572.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.84 : 578.41 = 384.92 : x
  2. Step 2: Convert to fraction form
    388.84/578.41 = 384.92/x
  3. Step 3: Cross multiply
    388.84x = 578.41 × 384.92
  4. Step 4: Simplify right side
    388.84x = 222,641.58
  5. Step 5: Solve for x
    x = 222,641.58/388.84
  6. Step 6: Final answer
    x = 572.58

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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.