Home / 1,643.60-2,267.28-979.99

Finding the Fourth Proportional to 1,643.60, 2,267.28 and 979.99

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Solution

The fourth proportional to 1,643.60, 2,267.28 and 979.99 is: 1,351.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.60 : 2,267.28 = 979.99 : x
  2. Step 2: Convert to fraction form
    1,643.60/2,267.28 = 979.99/x
  3. Step 3: Cross multiply
    1,643.60x = 2,267.28 × 979.99
  4. Step 4: Simplify right side
    1,643.60x = 2,221,901.49
  5. Step 5: Solve for x
    x = 2,221,901.49/1,643.60
  6. Step 6: Final answer
    x = 1,351.85

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1.5x scale

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.