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Finding the Fourth Proportional to 1,413.68, 2,120.80 and 489.32

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Solution

The fourth proportional to 1,413.68, 2,120.80 and 489.32 is: 734.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.68 : 2,120.80 = 489.32 : x
  2. Step 2: Convert to fraction form
    1,413.68/2,120.80 = 489.32/x
  3. Step 3: Cross multiply
    1,413.68x = 2,120.80 × 489.32
  4. Step 4: Simplify right side
    1,413.68x = 1,037,749.86
  5. Step 5: Solve for x
    x = 1,037,749.86/1,413.68
  6. Step 6: Final answer
    x = 734.08

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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.