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Finding the Fourth Proportional to 1,080.41, 1,620.56 and 386.89

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Solution

The fourth proportional to 1,080.41, 1,620.56 and 386.89 is: 580.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.41 : 1,620.56 = 386.89 : x
  2. Step 2: Convert to fraction form
    1,080.41/1,620.56 = 386.89/x
  3. Step 3: Cross multiply
    1,080.41x = 1,620.56 × 386.89
  4. Step 4: Simplify right side
    1,080.41x = 626,982.31
  5. Step 5: Solve for x
    x = 626,982.31/1,080.41
  6. Step 6: Final answer
    x = 580.32

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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.