Home / 1,328.58-1,990.97-979.16

Finding the Fourth Proportional to 1,328.58, 1,990.97 and 979.16

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Solution

The fourth proportional to 1,328.58, 1,990.97 and 979.16 is: 1,467.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.58 : 1,990.97 = 979.16 : x
  2. Step 2: Convert to fraction form
    1,328.58/1,990.97 = 979.16/x
  3. Step 3: Cross multiply
    1,328.58x = 1,990.97 × 979.16
  4. Step 4: Simplify right side
    1,328.58x = 1,949,485.61
  5. Step 5: Solve for x
    x = 1,949,485.61/1,328.58
  6. Step 6: Final answer
    x = 1,467.35

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1.5x scale

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.