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Finding the Fourth Proportional to 278.16, 416.40 and 274.56

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Solution

The fourth proportional to 278.16, 416.40 and 274.56 is: 411.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.16 : 416.40 = 274.56 : x
  2. Step 2: Convert to fraction form
    278.16/416.40 = 274.56/x
  3. Step 3: Cross multiply
    278.16x = 416.40 × 274.56
  4. Step 4: Simplify right side
    278.16x = 114,326.78
  5. Step 5: Solve for x
    x = 114,326.78/278.16
  6. Step 6: Final answer
    x = 411.01

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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.