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Finding the Fourth Proportional to 864.35, 1,190.90 and 771.11

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Solution

The fourth proportional to 864.35, 1,190.90 and 771.11 is: 1,062.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.35 : 1,190.90 = 771.11 : x
  2. Step 2: Convert to fraction form
    864.35/1,190.90 = 771.11/x
  3. Step 3: Cross multiply
    864.35x = 1,190.90 × 771.11
  4. Step 4: Simplify right side
    864.35x = 918,311.04
  5. Step 5: Solve for x
    x = 918,311.04/864.35
  6. Step 6: Final answer
    x = 1,062.43

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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.