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Finding the Fourth Proportional to 1,122.61, 1,683.80 and 300.97

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Solution

The fourth proportional to 1,122.61, 1,683.80 and 300.97 is: 451.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.61 : 1,683.80 = 300.97 : x
  2. Step 2: Convert to fraction form
    1,122.61/1,683.80 = 300.97/x
  3. Step 3: Cross multiply
    1,122.61x = 1,683.80 × 300.97
  4. Step 4: Simplify right side
    1,122.61x = 506,768.70
  5. Step 5: Solve for x
    x = 506,768.70/1,122.61
  6. Step 6: Final answer
    x = 451.42

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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.