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Finding the Fourth Proportional to 561.45, 840.96 and 378

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Solution

The fourth proportional to 561.45, 840.96 and 378 is: 566.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.45 : 840.96 = 378 : x
  2. Step 2: Convert to fraction form
    561.45/840.96 = 378/x
  3. Step 3: Cross multiply
    561.45x = 840.96 × 378
  4. Step 4: Simplify right side
    561.45x = 317,882.88
  5. Step 5: Solve for x
    x = 317,882.88/561.45
  6. Step 6: Final answer
    x = 566.18

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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.