Home / 1,079.51-1,619.28-421.43

Finding the Fourth Proportional to 1,079.51, 1,619.28 and 421.43

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Solution

The fourth proportional to 1,079.51, 1,619.28 and 421.43 is: 632.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.51 : 1,619.28 = 421.43 : x
  2. Step 2: Convert to fraction form
    1,079.51/1,619.28 = 421.43/x
  3. Step 3: Cross multiply
    1,079.51x = 1,619.28 × 421.43
  4. Step 4: Simplify right side
    1,079.51x = 682,413.17
  5. Step 5: Solve for x
    x = 682,413.17/1,079.51
  6. Step 6: Final answer
    x = 632.15

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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.