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Finding the Fourth Proportional to 991.48, 1,487.26 and 443.67

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Solution

The fourth proportional to 991.48, 1,487.26 and 443.67 is: 665.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.48 : 1,487.26 = 443.67 : x
  2. Step 2: Convert to fraction form
    991.48/1,487.26 = 443.67/x
  3. Step 3: Cross multiply
    991.48x = 1,487.26 × 443.67
  4. Step 4: Simplify right side
    991.48x = 659,842.99
  5. Step 5: Solve for x
    x = 659,842.99/991.48
  6. Step 6: Final answer
    x = 665.52

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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.