Home / 1,643.20-2,267.82-979.72

Finding the Fourth Proportional to 1,643.20, 2,267.82 and 979.72

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Solution

The fourth proportional to 1,643.20, 2,267.82 and 979.72 is: 1,352.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.20 : 2,267.82 = 979.72 : x
  2. Step 2: Convert to fraction form
    1,643.20/2,267.82 = 979.72/x
  3. Step 3: Cross multiply
    1,643.20x = 2,267.82 × 979.72
  4. Step 4: Simplify right side
    1,643.20x = 2,221,828.61
  5. Step 5: Solve for x
    x = 2,221,828.61/1,643.20
  6. Step 6: Final answer
    x = 1,352.14

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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.