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Finding the Fourth Proportional to 278.16, 416.92 and 209.46

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Solution

The fourth proportional to 278.16, 416.92 and 209.46 is: 313.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.16 : 416.92 = 209.46 : x
  2. Step 2: Convert to fraction form
    278.16/416.92 = 209.46/x
  3. Step 3: Cross multiply
    278.16x = 416.92 × 209.46
  4. Step 4: Simplify right side
    278.16x = 87,328.06
  5. Step 5: Solve for x
    x = 87,328.06/278.16
  6. Step 6: Final answer
    x = 313.95

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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.