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Finding the Fourth Proportional to 740.67, 1,111.79 and 330.09

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Solution

The fourth proportional to 740.67, 1,111.79 and 330.09 is: 495.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.67 : 1,111.79 = 330.09 : x
  2. Step 2: Convert to fraction form
    740.67/1,111.79 = 330.09/x
  3. Step 3: Cross multiply
    740.67x = 1,111.79 × 330.09
  4. Step 4: Simplify right side
    740.67x = 366,989.11
  5. Step 5: Solve for x
    x = 366,989.11/740.67
  6. Step 6: Final answer
    x = 495.48

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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.