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Finding the Fourth Proportional to 1,383.78, 2,075.69 and 343.78

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Solution

The fourth proportional to 1,383.78, 2,075.69 and 343.78 is: 515.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.78 : 2,075.69 = 343.78 : x
  2. Step 2: Convert to fraction form
    1,383.78/2,075.69 = 343.78/x
  3. Step 3: Cross multiply
    1,383.78x = 2,075.69 × 343.78
  4. Step 4: Simplify right side
    1,383.78x = 713,580.71
  5. Step 5: Solve for x
    x = 713,580.71/1,383.78
  6. Step 6: Final answer
    x = 515.67

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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.