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Finding the Fourth Proportional to 992.08, 1,487.64 and 443.92

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Solution

The fourth proportional to 992.08, 1,487.64 and 443.92 is: 665.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.08 : 1,487.64 = 443.92 : x
  2. Step 2: Convert to fraction form
    992.08/1,487.64 = 443.92/x
  3. Step 3: Cross multiply
    992.08x = 1,487.64 × 443.92
  4. Step 4: Simplify right side
    992.08x = 660,393.15
  5. Step 5: Solve for x
    x = 660,393.15/992.08
  6. Step 6: Final answer
    x = 665.67

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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.