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Finding the Fourth Proportional to 208.51, 312.73 and 83.43

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Solution

The fourth proportional to 208.51, 312.73 and 83.43 is: 125.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.51 : 312.73 = 83.43 : x
  2. Step 2: Convert to fraction form
    208.51/312.73 = 83.43/x
  3. Step 3: Cross multiply
    208.51x = 312.73 × 83.43
  4. Step 4: Simplify right side
    208.51x = 26,090.86
  5. Step 5: Solve for x
    x = 26,090.86/208.51
  6. Step 6: Final answer
    x = 125.13

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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.