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Finding the Fourth Proportional to 1,383.68, 2,075.16 and 653.06

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Solution

The fourth proportional to 1,383.68, 2,075.16 and 653.06 is: 979.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.68 : 2,075.16 = 653.06 : x
  2. Step 2: Convert to fraction form
    1,383.68/2,075.16 = 653.06/x
  3. Step 3: Cross multiply
    1,383.68x = 2,075.16 × 653.06
  4. Step 4: Simplify right side
    1,383.68x = 1,355,203.99
  5. Step 5: Solve for x
    x = 1,355,203.99/1,383.68
  6. Step 6: Final answer
    x = 979.42

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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.