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Finding the Fourth Proportional to 408.48, 615.60 and 384.16

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Solution

The fourth proportional to 408.48, 615.60 and 384.16 is: 578.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.48 : 615.60 = 384.16 : x
  2. Step 2: Convert to fraction form
    408.48/615.60 = 384.16/x
  3. Step 3: Cross multiply
    408.48x = 615.60 × 384.16
  4. Step 4: Simplify right side
    408.48x = 236,488.90
  5. Step 5: Solve for x
    x = 236,488.90/408.48
  6. Step 6: Final answer
    x = 578.95

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.