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Finding the Fourth Proportional to 783.23, 1,174.34 and 320.55

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Solution

The fourth proportional to 783.23, 1,174.34 and 320.55 is: 480.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.23 : 1,174.34 = 320.55 : x
  2. Step 2: Convert to fraction form
    783.23/1,174.34 = 320.55/x
  3. Step 3: Cross multiply
    783.23x = 1,174.34 × 320.55
  4. Step 4: Simplify right side
    783.23x = 376,433.08
  5. Step 5: Solve for x
    x = 376,433.08/783.23
  6. Step 6: Final answer
    x = 480.61

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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.