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Finding the Fourth Proportional to 1,119.21, 1,677.66 and 388.59

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Solution

The fourth proportional to 1,119.21, 1,677.66 and 388.59 is: 582.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.21 : 1,677.66 = 388.59 : x
  2. Step 2: Convert to fraction form
    1,119.21/1,677.66 = 388.59/x
  3. Step 3: Cross multiply
    1,119.21x = 1,677.66 × 388.59
  4. Step 4: Simplify right side
    1,119.21x = 651,921.90
  5. Step 5: Solve for x
    x = 651,921.90/1,119.21
  6. Step 6: Final answer
    x = 582.48

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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.