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Finding the Fourth Proportional to 1,383.62, 2,075.78 and 409.72

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Solution

The fourth proportional to 1,383.62, 2,075.78 and 409.72 is: 614.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.62 : 2,075.78 = 409.72 : x
  2. Step 2: Convert to fraction form
    1,383.62/2,075.78 = 409.72/x
  3. Step 3: Cross multiply
    1,383.62x = 2,075.78 × 409.72
  4. Step 4: Simplify right side
    1,383.62x = 850,488.58
  5. Step 5: Solve for x
    x = 850,488.58/1,383.62
  6. Step 6: Final answer
    x = 614.68

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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.