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Finding the Fourth Proportional to 1,122.38, 1,683.59 and 391.95

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Solution

The fourth proportional to 1,122.38, 1,683.59 and 391.95 is: 587.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.38 : 1,683.59 = 391.95 : x
  2. Step 2: Convert to fraction form
    1,122.38/1,683.59 = 391.95/x
  3. Step 3: Cross multiply
    1,122.38x = 1,683.59 × 391.95
  4. Step 4: Simplify right side
    1,122.38x = 659,881.14
  5. Step 5: Solve for x
    x = 659,881.14/1,122.38
  6. Step 6: Final answer
    x = 587.93

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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.