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Finding the Fourth Proportional to 1,487.54, 2,231.92 and 665.60

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Solution

The fourth proportional to 1,487.54, 2,231.92 and 665.60 is: 998.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.54 : 2,231.92 = 665.60 : x
  2. Step 2: Convert to fraction form
    1,487.54/2,231.92 = 665.60/x
  3. Step 3: Cross multiply
    1,487.54x = 2,231.92 × 665.60
  4. Step 4: Simplify right side
    1,487.54x = 1,485,565.95
  5. Step 5: Solve for x
    x = 1,485,565.95/1,487.54
  6. Step 6: Final answer
    x = 998.67

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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.