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Finding the Fourth Proportional to 388.10, 579.14 and 378.84

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Solution

The fourth proportional to 388.10, 579.14 and 378.84 is: 565.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.10 : 579.14 = 378.84 : x
  2. Step 2: Convert to fraction form
    388.10/579.14 = 378.84/x
  3. Step 3: Cross multiply
    388.10x = 579.14 × 378.84
  4. Step 4: Simplify right side
    388.10x = 219,401.40
  5. Step 5: Solve for x
    x = 219,401.40/388.10
  6. Step 6: Final answer
    x = 565.32

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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.