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Finding the Fourth Proportional to 771.39, 1,157.09 and 726.30

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Solution

The fourth proportional to 771.39, 1,157.09 and 726.30 is: 1,089.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.39 : 1,157.09 = 726.30 : x
  2. Step 2: Convert to fraction form
    771.39/1,157.09 = 726.30/x
  3. Step 3: Cross multiply
    771.39x = 1,157.09 × 726.30
  4. Step 4: Simplify right side
    771.39x = 840,390.84
  5. Step 5: Solve for x
    x = 840,390.84/771.39
  6. Step 6: Final answer
    x = 1,089.45

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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.