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Finding the Fourth Proportional to 505.78, 758.55 and 140.60

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Solution

The fourth proportional to 505.78, 758.55 and 140.60 is: 210.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.78 : 758.55 = 140.60 : x
  2. Step 2: Convert to fraction form
    505.78/758.55 = 140.60/x
  3. Step 3: Cross multiply
    505.78x = 758.55 × 140.60
  4. Step 4: Simplify right side
    505.78x = 106,654.55
  5. Step 5: Solve for x
    x = 106,654.55/505.78
  6. Step 6: Final answer
    x = 210.87

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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.