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Finding the Fourth Proportional to 388.16, 580.80 and 285.52

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Solution

The fourth proportional to 388.16, 580.80 and 285.52 is: 427.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.16 : 580.80 = 285.52 : x
  2. Step 2: Convert to fraction form
    388.16/580.80 = 285.52/x
  3. Step 3: Cross multiply
    388.16x = 580.80 × 285.52
  4. Step 4: Simplify right side
    388.16x = 165,830.02
  5. Step 5: Solve for x
    x = 165,830.02/388.16
  6. Step 6: Final answer
    x = 427.22

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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.