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Finding the Fourth Proportional to 305.78, 458.87 and 157.55

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Solution

The fourth proportional to 305.78, 458.87 and 157.55 is: 236.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.78 : 458.87 = 157.55 : x
  2. Step 2: Convert to fraction form
    305.78/458.87 = 157.55/x
  3. Step 3: Cross multiply
    305.78x = 458.87 × 157.55
  4. Step 4: Simplify right side
    305.78x = 72,291.89
  5. Step 5: Solve for x
    x = 72,291.89/305.78
  6. Step 6: Final answer
    x = 236.42

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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.