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Finding the Fourth Proportional to 1,390.75, 1,907.05 and 1,344.17

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Solution

The fourth proportional to 1,390.75, 1,907.05 and 1,344.17 is: 1,843.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.75 : 1,907.05 = 1,344.17 : x
  2. Step 2: Convert to fraction form
    1,390.75/1,907.05 = 1,344.17/x
  3. Step 3: Cross multiply
    1,390.75x = 1,907.05 × 1,344.17
  4. Step 4: Simplify right side
    1,390.75x = 2,563,399.40
  5. Step 5: Solve for x
    x = 2,563,399.40/1,390.75
  6. Step 6: Final answer
    x = 1,843.18

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.