Home / 1,413.12-2,119.90-439.32

Finding the Fourth Proportional to 1,413.12, 2,119.90 and 439.32

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Solution

The fourth proportional to 1,413.12, 2,119.90 and 439.32 is: 659.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.12 : 2,119.90 = 439.32 : x
  2. Step 2: Convert to fraction form
    1,413.12/2,119.90 = 439.32/x
  3. Step 3: Cross multiply
    1,413.12x = 2,119.90 × 439.32
  4. Step 4: Simplify right side
    1,413.12x = 931,314.47
  5. Step 5: Solve for x
    x = 931,314.47/1,413.12
  6. Step 6: Final answer
    x = 659.05

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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.