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Finding the Fourth Proportional to 208.68, 312.74 and 140.28

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Solution

The fourth proportional to 208.68, 312.74 and 140.28 is: 210.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.68 : 312.74 = 140.28 : x
  2. Step 2: Convert to fraction form
    208.68/312.74 = 140.28/x
  3. Step 3: Cross multiply
    208.68x = 312.74 × 140.28
  4. Step 4: Simplify right side
    208.68x = 43,871.17
  5. Step 5: Solve for x
    x = 43,871.17/208.68
  6. Step 6: Final answer
    x = 210.23

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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.