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Finding the Fourth Proportional to 278.45, 417.52 and 95.80

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Solution

The fourth proportional to 278.45, 417.52 and 95.80 is: 143.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.45 : 417.52 = 95.80 : x
  2. Step 2: Convert to fraction form
    278.45/417.52 = 95.80/x
  3. Step 3: Cross multiply
    278.45x = 417.52 × 95.80
  4. Step 4: Simplify right side
    278.45x = 39,997.13
  5. Step 5: Solve for x
    x = 39,997.13/278.45
  6. Step 6: Final answer
    x = 143.64

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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.