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Finding the Fourth Proportional to 356.80, 492.16 and 279.36

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Solution

The fourth proportional to 356.80, 492.16 and 279.36 is: 385.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.80 : 492.16 = 279.36 : x
  2. Step 2: Convert to fraction form
    356.80/492.16 = 279.36/x
  3. Step 3: Cross multiply
    356.80x = 492.16 × 279.36
  4. Step 4: Simplify right side
    356.80x = 137,489.82
  5. Step 5: Solve for x
    x = 137,489.82/356.80
  6. Step 6: Final answer
    x = 385.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.