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Finding the Fourth Proportional to 278.08, 416.66 and 140.78

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Solution

The fourth proportional to 278.08, 416.66 and 140.78 is: 210.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.08 : 416.66 = 140.78 : x
  2. Step 2: Convert to fraction form
    278.08/416.66 = 140.78/x
  3. Step 3: Cross multiply
    278.08x = 416.66 × 140.78
  4. Step 4: Simplify right side
    278.08x = 58,657.39
  5. Step 5: Solve for x
    x = 58,657.39/278.08
  6. Step 6: Final answer
    x = 210.94

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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.