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Finding the Fourth Proportional to 413.78, 570.88 and 256.33

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Solution

The fourth proportional to 413.78, 570.88 and 256.33 is: 353.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.78 : 570.88 = 256.33 : x
  2. Step 2: Convert to fraction form
    413.78/570.88 = 256.33/x
  3. Step 3: Cross multiply
    413.78x = 570.88 × 256.33
  4. Step 4: Simplify right side
    413.78x = 146,334.70
  5. Step 5: Solve for x
    x = 146,334.70/413.78
  6. Step 6: Final answer
    x = 353.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.