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Finding the Fourth Proportional to 208.34, 287.40 and 125.40

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Solution

The fourth proportional to 208.34, 287.40 and 125.40 is: 172.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.34 : 287.40 = 125.40 : x
  2. Step 2: Convert to fraction form
    208.34/287.40 = 125.40/x
  3. Step 3: Cross multiply
    208.34x = 287.40 × 125.40
  4. Step 4: Simplify right side
    208.34x = 36,039.96
  5. Step 5: Solve for x
    x = 36,039.96/208.34
  6. Step 6: Final answer
    x = 172.99

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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.