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Finding the Fourth Proportional to 734.88, 1,020.94 and 728.08

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Solution

The fourth proportional to 734.88, 1,020.94 and 728.08 is: 1,011.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    734.88 : 1,020.94 = 728.08 : x
  2. Step 2: Convert to fraction form
    734.88/1,020.94 = 728.08/x
  3. Step 3: Cross multiply
    734.88x = 1,020.94 × 728.08
  4. Step 4: Simplify right side
    734.88x = 743,326.00
  5. Step 5: Solve for x
    x = 743,326.00/734.88
  6. Step 6: Final answer
    x = 1,011.49

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.