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Finding the Fourth Proportional to 208.84, 312.90 and 144.04

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Solution

The fourth proportional to 208.84, 312.90 and 144.04 is: 215.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.84 : 312.90 = 144.04 : x
  2. Step 2: Convert to fraction form
    208.84/312.90 = 144.04/x
  3. Step 3: Cross multiply
    208.84x = 312.90 × 144.04
  4. Step 4: Simplify right side
    208.84x = 45,070.12
  5. Step 5: Solve for x
    x = 45,070.12/208.84
  6. Step 6: Final answer
    x = 215.81

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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.