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Finding the Fourth Proportional to 1,918.22, 2,877.93 and 685.90

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Solution

The fourth proportional to 1,918.22, 2,877.93 and 685.90 is: 1,029.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.22 : 2,877.93 = 685.90 : x
  2. Step 2: Convert to fraction form
    1,918.22/2,877.93 = 685.90/x
  3. Step 3: Cross multiply
    1,918.22x = 2,877.93 × 685.90
  4. Step 4: Simplify right side
    1,918.22x = 1,973,975.78
  5. Step 5: Solve for x
    x = 1,973,975.78/1,918.22
  6. Step 6: Final answer
    x = 1,029.07

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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.