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Finding the Fourth Proportional to 1,918.07, 2,877.11 and 821.73

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Solution

The fourth proportional to 1,918.07, 2,877.11 and 821.73 is: 1,232.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.07 : 2,877.11 = 821.73 : x
  2. Step 2: Convert to fraction form
    1,918.07/2,877.11 = 821.73/x
  3. Step 3: Cross multiply
    1,918.07x = 2,877.11 × 821.73
  4. Step 4: Simplify right side
    1,918.07x = 2,364,195.78
  5. Step 5: Solve for x
    x = 2,364,195.78/1,918.07
  6. Step 6: Final answer
    x = 1,232.59

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1.5x scale

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.