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Finding the Fourth Proportional to 326.64, 491.94 and 278.16

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Solution

The fourth proportional to 326.64, 491.94 and 278.16 is: 418.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.64 : 491.94 = 278.16 : x
  2. Step 2: Convert to fraction form
    326.64/491.94 = 278.16/x
  3. Step 3: Cross multiply
    326.64x = 491.94 × 278.16
  4. Step 4: Simplify right side
    326.64x = 136,838.03
  5. Step 5: Solve for x
    x = 136,838.03/326.64
  6. Step 6: Final answer
    x = 418.93

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.