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Finding the Fourth Proportional to 1,235.67, 1,853.51 and 413.79

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Solution

The fourth proportional to 1,235.67, 1,853.51 and 413.79 is: 620.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.67 : 1,853.51 = 413.79 : x
  2. Step 2: Convert to fraction form
    1,235.67/1,853.51 = 413.79/x
  3. Step 3: Cross multiply
    1,235.67x = 1,853.51 × 413.79
  4. Step 4: Simplify right side
    1,235.67x = 766,961.83
  5. Step 5: Solve for x
    x = 766,961.83/1,235.67
  6. Step 6: Final answer
    x = 620.69

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Double scale
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1.5x scale

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.