Home / 1,081.34-1,621.54-388.18

Finding the Fourth Proportional to 1,081.34, 1,621.54 and 388.18

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Solution

The fourth proportional to 1,081.34, 1,621.54 and 388.18 is: 582.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.34 : 1,621.54 = 388.18 : x
  2. Step 2: Convert to fraction form
    1,081.34/1,621.54 = 388.18/x
  3. Step 3: Cross multiply
    1,081.34x = 1,621.54 × 388.18
  4. Step 4: Simplify right side
    1,081.34x = 629,449.40
  5. Step 5: Solve for x
    x = 629,449.40/1,081.34
  6. Step 6: Final answer
    x = 582.10

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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.