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Finding the Fourth Proportional to 187.08, 280.74 and 71.60

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Solution

The fourth proportional to 187.08, 280.74 and 71.60 is: 107.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.08 : 280.74 = 71.60 : x
  2. Step 2: Convert to fraction form
    187.08/280.74 = 71.60/x
  3. Step 3: Cross multiply
    187.08x = 280.74 × 71.60
  4. Step 4: Simplify right side
    187.08x = 20,100.98
  5. Step 5: Solve for x
    x = 20,100.98/187.08
  6. Step 6: Final answer
    x = 107.45

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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.