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Finding the Fourth Proportional to 1,383.18, 2,074.22 and 689.60

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Solution

The fourth proportional to 1,383.18, 2,074.22 and 689.60 is: 1,034.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.18 : 2,074.22 = 689.60 : x
  2. Step 2: Convert to fraction form
    1,383.18/2,074.22 = 689.60/x
  3. Step 3: Cross multiply
    1,383.18x = 2,074.22 × 689.60
  4. Step 4: Simplify right side
    1,383.18x = 1,430,382.11
  5. Step 5: Solve for x
    x = 1,430,382.11/1,383.18
  6. Step 6: Final answer
    x = 1,034.13

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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.