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Finding the Fourth Proportional to 1,391.31, 2,084.94 and 651.15

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Solution

The fourth proportional to 1,391.31, 2,084.94 and 651.15 is: 975.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.31 : 2,084.94 = 651.15 : x
  2. Step 2: Convert to fraction form
    1,391.31/2,084.94 = 651.15/x
  3. Step 3: Cross multiply
    1,391.31x = 2,084.94 × 651.15
  4. Step 4: Simplify right side
    1,391.31x = 1,357,608.68
  5. Step 5: Solve for x
    x = 1,357,608.68/1,391.31
  6. Step 6: Final answer
    x = 975.78

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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.