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Finding the Fourth Proportional to 771.98, 1,158.43 and 285.38

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Solution

The fourth proportional to 771.98, 1,158.43 and 285.38 is: 428.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.98 : 1,158.43 = 285.38 : x
  2. Step 2: Convert to fraction form
    771.98/1,158.43 = 285.38/x
  3. Step 3: Cross multiply
    771.98x = 1,158.43 × 285.38
  4. Step 4: Simplify right side
    771.98x = 330,592.75
  5. Step 5: Solve for x
    x = 330,592.75/771.98
  6. Step 6: Final answer
    x = 428.24

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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.