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Finding the Fourth Proportional to 1,383.55, 2,075.07 and 409.42

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Solution

The fourth proportional to 1,383.55, 2,075.07 and 409.42 is: 614.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.55 : 2,075.07 = 409.42 : x
  2. Step 2: Convert to fraction form
    1,383.55/2,075.07 = 409.42/x
  3. Step 3: Cross multiply
    1,383.55x = 2,075.07 × 409.42
  4. Step 4: Simplify right side
    1,383.55x = 849,575.16
  5. Step 5: Solve for x
    x = 849,575.16/1,383.55
  6. Step 6: Final answer
    x = 614.05

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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.