Home / 1,643.12-2,267.21-979.86

Finding the Fourth Proportional to 1,643.12, 2,267.21 and 979.86

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Solution

The fourth proportional to 1,643.12, 2,267.21 and 979.86 is: 1,352.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.12 : 2,267.21 = 979.86 : x
  2. Step 2: Convert to fraction form
    1,643.12/2,267.21 = 979.86/x
  3. Step 3: Cross multiply
    1,643.12x = 2,267.21 × 979.86
  4. Step 4: Simplify right side
    1,643.12x = 2,221,543.49
  5. Step 5: Solve for x
    x = 2,221,543.49/1,643.12
  6. Step 6: Final answer
    x = 1,352.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.