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Finding the Fourth Proportional to 1,119.34, 1,678.91 and 378.93

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Solution

The fourth proportional to 1,119.34, 1,678.91 and 378.93 is: 568.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.34 : 1,678.91 = 378.93 : x
  2. Step 2: Convert to fraction form
    1,119.34/1,678.91 = 378.93/x
  3. Step 3: Cross multiply
    1,119.34x = 1,678.91 × 378.93
  4. Step 4: Simplify right side
    1,119.34x = 636,187.47
  5. Step 5: Solve for x
    x = 636,187.47/1,119.34
  6. Step 6: Final answer
    x = 568.36

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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.