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Finding the Fourth Proportional to 1,080.48, 1,620.71 and 387.02

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Solution

The fourth proportional to 1,080.48, 1,620.71 and 387.02 is: 580.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.48 : 1,620.71 = 387.02 : x
  2. Step 2: Convert to fraction form
    1,080.48/1,620.71 = 387.02/x
  3. Step 3: Cross multiply
    1,080.48x = 1,620.71 × 387.02
  4. Step 4: Simplify right side
    1,080.48x = 627,239.08
  5. Step 5: Solve for x
    x = 627,239.08/1,080.48
  6. Step 6: Final answer
    x = 580.52

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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.