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Finding the Fourth Proportional to 208.07, 287.12 and 125.15

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Solution

The fourth proportional to 208.07, 287.12 and 125.15 is: 172.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.07 : 287.12 = 125.15 : x
  2. Step 2: Convert to fraction form
    208.07/287.12 = 125.15/x
  3. Step 3: Cross multiply
    208.07x = 287.12 × 125.15
  4. Step 4: Simplify right side
    208.07x = 35,931.01
  5. Step 5: Solve for x
    x = 35,931.01/208.07
  6. Step 6: Final answer
    x = 172.69

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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.