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Finding the Fourth Proportional to 1,080.76, 1,621.42 and 387.58

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Solution

The fourth proportional to 1,080.76, 1,621.42 and 387.58 is: 581.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.76 : 1,621.42 = 387.58 : x
  2. Step 2: Convert to fraction form
    1,080.76/1,621.42 = 387.58/x
  3. Step 3: Cross multiply
    1,080.76x = 1,621.42 × 387.58
  4. Step 4: Simplify right side
    1,080.76x = 628,429.96
  5. Step 5: Solve for x
    x = 628,429.96/1,080.76
  6. Step 6: Final answer
    x = 581.47

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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.