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Finding the Fourth Proportional to 354, 528.72 and 276.78

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Solution

The fourth proportional to 354, 528.72 and 276.78 is: 413.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    354 : 528.72 = 276.78 : x
  2. Step 2: Convert to fraction form
    354/528.72 = 276.78/x
  3. Step 3: Cross multiply
    354x = 528.72 × 276.78
  4. Step 4: Simplify right side
    354x = 146,339.12
  5. Step 5: Solve for x
    x = 146,339.12/354
  6. Step 6: Final answer
    x = 413.39

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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.