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Finding the Fourth Proportional to 1,327.89, 1,990.62 and 677.19

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Solution

The fourth proportional to 1,327.89, 1,990.62 and 677.19 is: 1,015.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.89 : 1,990.62 = 677.19 : x
  2. Step 2: Convert to fraction form
    1,327.89/1,990.62 = 677.19/x
  3. Step 3: Cross multiply
    1,327.89x = 1,990.62 × 677.19
  4. Step 4: Simplify right side
    1,327.89x = 1,348,027.96
  5. Step 5: Solve for x
    x = 1,348,027.96/1,327.89
  6. Step 6: Final answer
    x = 1,015.17

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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.