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Finding the Fourth Proportional to 251.90, 377.87 and 78.60

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Solution

The fourth proportional to 251.90, 377.87 and 78.60 is: 117.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.90 : 377.87 = 78.60 : x
  2. Step 2: Convert to fraction form
    251.90/377.87 = 78.60/x
  3. Step 3: Cross multiply
    251.90x = 377.87 × 78.60
  4. Step 4: Simplify right side
    251.90x = 29,699.48
  5. Step 5: Solve for x
    x = 29,699.48/251.90
  6. Step 6: Final answer
    x = 117.90

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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.