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Finding the Fourth Proportional to 787.98, 1,174.29 and 764.22

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Solution

The fourth proportional to 787.98, 1,174.29 and 764.22 is: 1,138.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.98 : 1,174.29 = 764.22 : x
  2. Step 2: Convert to fraction form
    787.98/1,174.29 = 764.22/x
  3. Step 3: Cross multiply
    787.98x = 1,174.29 × 764.22
  4. Step 4: Simplify right side
    787.98x = 897,416.49
  5. Step 5: Solve for x
    x = 897,416.49/787.98
  6. Step 6: Final answer
    x = 1,138.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.