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Finding the Fourth Proportional to 1,386.98, 1,914.21 and 797.57

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Solution

The fourth proportional to 1,386.98, 1,914.21 and 797.57 is: 1,100.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.98 : 1,914.21 = 797.57 : x
  2. Step 2: Convert to fraction form
    1,386.98/1,914.21 = 797.57/x
  3. Step 3: Cross multiply
    1,386.98x = 1,914.21 × 797.57
  4. Step 4: Simplify right side
    1,386.98x = 1,526,706.90
  5. Step 5: Solve for x
    x = 1,526,706.90/1,386.98
  6. Step 6: Final answer
    x = 1,100.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.