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Finding the Fourth Proportional to 413.56, 570.70 and 238.90

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Solution

The fourth proportional to 413.56, 570.70 and 238.90 is: 329.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.56 : 570.70 = 238.90 : x
  2. Step 2: Convert to fraction form
    413.56/570.70 = 238.90/x
  3. Step 3: Cross multiply
    413.56x = 570.70 × 238.90
  4. Step 4: Simplify right side
    413.56x = 136,340.23
  5. Step 5: Solve for x
    x = 136,340.23/413.56
  6. Step 6: Final answer
    x = 329.67

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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.