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Finding the Fourth Proportional to 278.28, 417.34 and 95.64

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Solution

The fourth proportional to 278.28, 417.34 and 95.64 is: 143.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.28 : 417.34 = 95.64 : x
  2. Step 2: Convert to fraction form
    278.28/417.34 = 95.64/x
  3. Step 3: Cross multiply
    278.28x = 417.34 × 95.64
  4. Step 4: Simplify right side
    278.28x = 39,914.40
  5. Step 5: Solve for x
    x = 39,914.40/278.28
  6. Step 6: Final answer
    x = 143.43

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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.