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Finding the Fourth Proportional to 1,124.26, 1,685.33 and 393.64

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Solution

The fourth proportional to 1,124.26, 1,685.33 and 393.64 is: 590.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.26 : 1,685.33 = 393.64 : x
  2. Step 2: Convert to fraction form
    1,124.26/1,685.33 = 393.64/x
  3. Step 3: Cross multiply
    1,124.26x = 1,685.33 × 393.64
  4. Step 4: Simplify right side
    1,124.26x = 663,413.30
  5. Step 5: Solve for x
    x = 663,413.30/1,124.26
  6. Step 6: Final answer
    x = 590.09

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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.