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Finding the Fourth Proportional to 1,118.36, 1,677.60 and 388.01

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Solution

The fourth proportional to 1,118.36, 1,677.60 and 388.01 is: 582.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.36 : 1,677.60 = 388.01 : x
  2. Step 2: Convert to fraction form
    1,118.36/1,677.60 = 388.01/x
  3. Step 3: Cross multiply
    1,118.36x = 1,677.60 × 388.01
  4. Step 4: Simplify right side
    1,118.36x = 650,917.19
  5. Step 5: Solve for x
    x = 650,917.19/1,118.36
  6. Step 6: Final answer
    x = 582.03

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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.