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Finding the Fourth Proportional to 388.46, 581.99 and 378.89

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Solution

The fourth proportional to 388.46, 581.99 and 378.89 is: 567.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.46 : 581.99 = 378.89 : x
  2. Step 2: Convert to fraction form
    388.46/581.99 = 378.89/x
  3. Step 3: Cross multiply
    388.46x = 581.99 × 378.89
  4. Step 4: Simplify right side
    388.46x = 220,507.28
  5. Step 5: Solve for x
    x = 220,507.28/388.46
  6. Step 6: Final answer
    x = 567.65

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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.