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Finding the Fourth Proportional to 208.35, 287.51 and 115.10

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Solution

The fourth proportional to 208.35, 287.51 and 115.10 is: 158.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.35 : 287.51 = 115.10 : x
  2. Step 2: Convert to fraction form
    208.35/287.51 = 115.10/x
  3. Step 3: Cross multiply
    208.35x = 287.51 × 115.10
  4. Step 4: Simplify right side
    208.35x = 33,090.39
  5. Step 5: Solve for x
    x = 33,090.39/208.35
  6. Step 6: Final answer
    x = 158.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.