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Finding the Fourth Proportional to 278.01, 416.21 and 256.48

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Solution

The fourth proportional to 278.01, 416.21 and 256.48 is: 383.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.01 : 416.21 = 256.48 : x
  2. Step 2: Convert to fraction form
    278.01/416.21 = 256.48/x
  3. Step 3: Cross multiply
    278.01x = 416.21 × 256.48
  4. Step 4: Simplify right side
    278.01x = 106,747.22
  5. Step 5: Solve for x
    x = 106,747.22/278.01
  6. Step 6: Final answer
    x = 383.97

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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.