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Finding the Fourth Proportional to 368.99, 553.55 and 206.45

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Solution

The fourth proportional to 368.99, 553.55 and 206.45 is: 309.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.99 : 553.55 = 206.45 : x
  2. Step 2: Convert to fraction form
    368.99/553.55 = 206.45/x
  3. Step 3: Cross multiply
    368.99x = 553.55 × 206.45
  4. Step 4: Simplify right side
    368.99x = 114,276.60
  5. Step 5: Solve for x
    x = 114,276.60/368.99
  6. Step 6: Final answer
    x = 309.71

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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.