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Finding the Fourth Proportional to 480.60, 662.40 and 387

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Solution

The fourth proportional to 480.60, 662.40 and 387 is: 533.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.60 : 662.40 = 387 : x
  2. Step 2: Convert to fraction form
    480.60/662.40 = 387/x
  3. Step 3: Cross multiply
    480.60x = 662.40 × 387
  4. Step 4: Simplify right side
    480.60x = 256,348.80
  5. Step 5: Solve for x
    x = 256,348.80/480.60
  6. Step 6: Final answer
    x = 533.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.