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Finding the Fourth Proportional to 278.94, 417.89 and 192.17

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Solution

The fourth proportional to 278.94, 417.89 and 192.17 is: 287.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.94 : 417.89 = 192.17 : x
  2. Step 2: Convert to fraction form
    278.94/417.89 = 192.17/x
  3. Step 3: Cross multiply
    278.94x = 417.89 × 192.17
  4. Step 4: Simplify right side
    278.94x = 80,307.45
  5. Step 5: Solve for x
    x = 80,307.45/278.94
  6. Step 6: Final answer
    x = 287.90

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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.