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Finding the Fourth Proportional to 278.05, 416.61 and 123.74

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Solution

The fourth proportional to 278.05, 416.61 and 123.74 is: 185.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.05 : 416.61 = 123.74 : x
  2. Step 2: Convert to fraction form
    278.05/416.61 = 123.74/x
  3. Step 3: Cross multiply
    278.05x = 416.61 × 123.74
  4. Step 4: Simplify right side
    278.05x = 51,551.32
  5. Step 5: Solve for x
    x = 51,551.32/278.05
  6. Step 6: Final answer
    x = 185.40

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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.