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Finding the Fourth Proportional to 278.63, 417.98 and 134.25

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Solution

The fourth proportional to 278.63, 417.98 and 134.25 is: 201.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.63 : 417.98 = 134.25 : x
  2. Step 2: Convert to fraction form
    278.63/417.98 = 134.25/x
  3. Step 3: Cross multiply
    278.63x = 417.98 × 134.25
  4. Step 4: Simplify right side
    278.63x = 56,114.15
  5. Step 5: Solve for x
    x = 56,114.15/278.63
  6. Step 6: Final answer
    x = 201.39

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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.