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Finding the Fourth Proportional to 278.79, 417.68 and 105.36

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Solution

The fourth proportional to 278.79, 417.68 and 105.36 is: 157.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.79 : 417.68 = 105.36 : x
  2. Step 2: Convert to fraction form
    278.79/417.68 = 105.36/x
  3. Step 3: Cross multiply
    278.79x = 417.68 × 105.36
  4. Step 4: Simplify right side
    278.79x = 44,006.24
  5. Step 5: Solve for x
    x = 44,006.24/278.79
  6. Step 6: Final answer
    x = 157.85

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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.