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Finding the Fourth Proportional to 1,413.42, 2,120.49 and 763.26

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Solution

The fourth proportional to 1,413.42, 2,120.49 and 763.26 is: 1,145.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.42 : 2,120.49 = 763.26 : x
  2. Step 2: Convert to fraction form
    1,413.42/2,120.49 = 763.26/x
  3. Step 3: Cross multiply
    1,413.42x = 2,120.49 × 763.26
  4. Step 4: Simplify right side
    1,413.42x = 1,618,485.20
  5. Step 5: Solve for x
    x = 1,618,485.20/1,413.42
  6. Step 6: Final answer
    x = 1,145.08

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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.