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Finding the Fourth Proportional to 370.21, 554.78 and 208.21

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Solution

The fourth proportional to 370.21, 554.78 and 208.21 is: 312.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.21 : 554.78 = 208.21 : x
  2. Step 2: Convert to fraction form
    370.21/554.78 = 208.21/x
  3. Step 3: Cross multiply
    370.21x = 554.78 × 208.21
  4. Step 4: Simplify right side
    370.21x = 115,509.70
  5. Step 5: Solve for x
    x = 115,509.70/370.21
  6. Step 6: Final answer
    x = 312.01

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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.