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Finding the Fourth Proportional to 651.36, 976.41 and 285.87

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Solution

The fourth proportional to 651.36, 976.41 and 285.87 is: 428.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.36 : 976.41 = 285.87 : x
  2. Step 2: Convert to fraction form
    651.36/976.41 = 285.87/x
  3. Step 3: Cross multiply
    651.36x = 976.41 × 285.87
  4. Step 4: Simplify right side
    651.36x = 279,126.33
  5. Step 5: Solve for x
    x = 279,126.33/651.36
  6. Step 6: Final answer
    x = 428.53

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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.