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Finding the Fourth Proportional to 278.55, 417.54 and 105.11

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Solution

The fourth proportional to 278.55, 417.54 and 105.11 is: 157.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.55 : 417.54 = 105.11 : x
  2. Step 2: Convert to fraction form
    278.55/417.54 = 105.11/x
  3. Step 3: Cross multiply
    278.55x = 417.54 × 105.11
  4. Step 4: Simplify right side
    278.55x = 43,887.63
  5. Step 5: Solve for x
    x = 43,887.63/278.55
  6. Step 6: Final answer
    x = 157.56

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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.