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Finding the Fourth Proportional to 1,382.19, 2,072.71 and 688.60

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Solution

The fourth proportional to 1,382.19, 2,072.71 and 688.60 is: 1,032.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.19 : 2,072.71 = 688.60 : x
  2. Step 2: Convert to fraction form
    1,382.19/2,072.71 = 688.60/x
  3. Step 3: Cross multiply
    1,382.19x = 2,072.71 × 688.60
  4. Step 4: Simplify right side
    1,382.19x = 1,427,268.11
  5. Step 5: Solve for x
    x = 1,427,268.11/1,382.19
  6. Step 6: Final answer
    x = 1,032.61

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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.