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Finding the Fourth Proportional to 912.88, 1,261.04 and 739

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Solution

The fourth proportional to 912.88, 1,261.04 and 739 is: 1,020.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.88 : 1,261.04 = 739 : x
  2. Step 2: Convert to fraction form
    912.88/1,261.04 = 739/x
  3. Step 3: Cross multiply
    912.88x = 1,261.04 × 739
  4. Step 4: Simplify right side
    912.88x = 931,908.56
  5. Step 5: Solve for x
    x = 931,908.56/912.88
  6. Step 6: Final answer
    x = 1,020.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.