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Finding the Fourth Proportional to 1,435.67, 1,981.19 and 806.20

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Solution

The fourth proportional to 1,435.67, 1,981.19 and 806.20 is: 1,112.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.67 : 1,981.19 = 806.20 : x
  2. Step 2: Convert to fraction form
    1,435.67/1,981.19 = 806.20/x
  3. Step 3: Cross multiply
    1,435.67x = 1,981.19 × 806.20
  4. Step 4: Simplify right side
    1,435.67x = 1,597,232.44
  5. Step 5: Solve for x
    x = 1,597,232.44/1,435.67
  6. Step 6: Final answer
    x = 1,112.54

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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.