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Finding the Fourth Proportional to 1,413.52, 2,120.70 and 682.96

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Solution

The fourth proportional to 1,413.52, 2,120.70 and 682.96 is: 1,024.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.52 : 2,120.70 = 682.96 : x
  2. Step 2: Convert to fraction form
    1,413.52/2,120.70 = 682.96/x
  3. Step 3: Cross multiply
    1,413.52x = 2,120.70 × 682.96
  4. Step 4: Simplify right side
    1,413.52x = 1,448,353.27
  5. Step 5: Solve for x
    x = 1,448,353.27/1,413.52
  6. Step 6: Final answer
    x = 1,024.64

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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.