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Finding the Fourth Proportional to 278.79, 419.00 and 134.61

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Solution

The fourth proportional to 278.79, 419.00 and 134.61 is: 202.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.79 : 419.00 = 134.61 : x
  2. Step 2: Convert to fraction form
    278.79/419.00 = 134.61/x
  3. Step 3: Cross multiply
    278.79x = 419.00 × 134.61
  4. Step 4: Simplify right side
    278.79x = 56,400.92
  5. Step 5: Solve for x
    x = 56,400.92/278.79
  6. Step 6: Final answer
    x = 202.31

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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.