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Finding the Fourth Proportional to 1,383.71, 2,075.79 and 644.06

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Solution

The fourth proportional to 1,383.71, 2,075.79 and 644.06 is: 966.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.71 : 2,075.79 = 644.06 : x
  2. Step 2: Convert to fraction form
    1,383.71/2,075.79 = 644.06/x
  3. Step 3: Cross multiply
    1,383.71x = 2,075.79 × 644.06
  4. Step 4: Simplify right side
    1,383.71x = 1,336,933.31
  5. Step 5: Solve for x
    x = 1,336,933.31/1,383.71
  6. Step 6: Final answer
    x = 966.19

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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.