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Finding the Fourth Proportional to 450.78, 675.93 and 142.55

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Solution

The fourth proportional to 450.78, 675.93 and 142.55 is: 213.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.78 : 675.93 = 142.55 : x
  2. Step 2: Convert to fraction form
    450.78/675.93 = 142.55/x
  3. Step 3: Cross multiply
    450.78x = 675.93 × 142.55
  4. Step 4: Simplify right side
    450.78x = 96,353.11
  5. Step 5: Solve for x
    x = 96,353.11/450.78
  6. Step 6: Final answer
    x = 213.75

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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.