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Finding the Fourth Proportional to 657.87, 987.21 and 365.60

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Solution

The fourth proportional to 657.87, 987.21 and 365.60 is: 548.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.87 : 987.21 = 365.60 : x
  2. Step 2: Convert to fraction form
    657.87/987.21 = 365.60/x
  3. Step 3: Cross multiply
    657.87x = 987.21 × 365.60
  4. Step 4: Simplify right side
    657.87x = 360,919.04
  5. Step 5: Solve for x
    x = 360,919.04/657.87
  6. Step 6: Final answer
    x = 548.62

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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.