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Finding the Fourth Proportional to 1,383.19, 1,908.80 and 859.22

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Solution

The fourth proportional to 1,383.19, 1,908.80 and 859.22 is: 1,185.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.19 : 1,908.80 = 859.22 : x
  2. Step 2: Convert to fraction form
    1,383.19/1,908.80 = 859.22/x
  3. Step 3: Cross multiply
    1,383.19x = 1,908.80 × 859.22
  4. Step 4: Simplify right side
    1,383.19x = 1,640,075.68
  5. Step 5: Solve for x
    x = 1,640,075.68/1,383.19
  6. Step 6: Final answer
    x = 1,185.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.