Home / 1,321.19-1,981.56-443.59

Finding the Fourth Proportional to 1,321.19, 1,981.56 and 443.59

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Solution

The fourth proportional to 1,321.19, 1,981.56 and 443.59 is: 665.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.19 : 1,981.56 = 443.59 : x
  2. Step 2: Convert to fraction form
    1,321.19/1,981.56 = 443.59/x
  3. Step 3: Cross multiply
    1,321.19x = 1,981.56 × 443.59
  4. Step 4: Simplify right side
    1,321.19x = 879,008.06
  5. Step 5: Solve for x
    x = 879,008.06/1,321.19
  6. Step 6: Final answer
    x = 665.32

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Double scale
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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.