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Finding the Fourth Proportional to 865.37, 1,190.97 and 786.89

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Solution

The fourth proportional to 865.37, 1,190.97 and 786.89 is: 1,082.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.37 : 1,190.97 = 786.89 : x
  2. Step 2: Convert to fraction form
    865.37/1,190.97 = 786.89/x
  3. Step 3: Cross multiply
    865.37x = 1,190.97 × 786.89
  4. Step 4: Simplify right side
    865.37x = 937,156.43
  5. Step 5: Solve for x
    x = 937,156.43/865.37
  6. Step 6: Final answer
    x = 1,082.96

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1.5x scale

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.