Home / 1,643.28-2,267.67-979.79

Finding the Fourth Proportional to 1,643.28, 2,267.67 and 979.79

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Solution

The fourth proportional to 1,643.28, 2,267.67 and 979.79 is: 1,352.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.28 : 2,267.67 = 979.79 : x
  2. Step 2: Convert to fraction form
    1,643.28/2,267.67 = 979.79/x
  3. Step 3: Cross multiply
    1,643.28x = 2,267.67 × 979.79
  4. Step 4: Simplify right side
    1,643.28x = 2,221,840.39
  5. Step 5: Solve for x
    x = 2,221,840.39/1,643.28
  6. Step 6: Final answer
    x = 1,352.08

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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.