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Finding the Fourth Proportional to 356.80, 492.38 and 201.55

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Solution

The fourth proportional to 356.80, 492.38 and 201.55 is: 278.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.80 : 492.38 = 201.55 : x
  2. Step 2: Convert to fraction form
    356.80/492.38 = 201.55/x
  3. Step 3: Cross multiply
    356.80x = 492.38 × 201.55
  4. Step 4: Simplify right side
    356.80x = 99,239.19
  5. Step 5: Solve for x
    x = 99,239.19/356.80
  6. Step 6: Final answer
    x = 278.14

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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.