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Finding the Fourth Proportional to 1,080.18, 1,619.91 and 689.63

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Solution

The fourth proportional to 1,080.18, 1,619.91 and 689.63 is: 1,034.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.18 : 1,619.91 = 689.63 : x
  2. Step 2: Convert to fraction form
    1,080.18/1,619.91 = 689.63/x
  3. Step 3: Cross multiply
    1,080.18x = 1,619.91 × 689.63
  4. Step 4: Simplify right side
    1,080.18x = 1,117,130.43
  5. Step 5: Solve for x
    x = 1,117,130.43/1,080.18
  6. Step 6: Final answer
    x = 1,034.21

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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.