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Finding the Third Proportional to 278.02 and 409.64

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Solution

The third proportional to 278.02 and 409.64 is: 603.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.02 : 409.64 = 409.64 : x
  2. Step 2: Convert to fraction form
    278.02/409.64 = 409.64/x
  3. Step 3: Cross multiply
    278.02x = 409.64 × 409.64
  4. Step 4: Simplify right side
    278.02x = 167,805.44
  5. Step 5: Solve for x
    x = 167,805.44/278.02
  6. Step 6: Final answer
    x = 603.58

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.