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Finding the Fourth Proportional to 1,118.88, 1,678.25 and 388.53

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Solution

The fourth proportional to 1,118.88, 1,678.25 and 388.53 is: 582.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.88 : 1,678.25 = 388.53 : x
  2. Step 2: Convert to fraction form
    1,118.88/1,678.25 = 388.53/x
  3. Step 3: Cross multiply
    1,118.88x = 1,678.25 × 388.53
  4. Step 4: Simplify right side
    1,118.88x = 652,051.44
  5. Step 5: Solve for x
    x = 652,051.44/1,118.88
  6. Step 6: Final answer
    x = 582.77

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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.