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Finding the Fourth Proportional to 989.28, 1,483.92 and 411.48

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Solution

The fourth proportional to 989.28, 1,483.92 and 411.48 is: 617.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.28 : 1,483.92 = 411.48 : x
  2. Step 2: Convert to fraction form
    989.28/1,483.92 = 411.48/x
  3. Step 3: Cross multiply
    989.28x = 1,483.92 × 411.48
  4. Step 4: Simplify right side
    989.28x = 610,603.40
  5. Step 5: Solve for x
    x = 610,603.40/989.28
  6. Step 6: Final answer
    x = 617.22

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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.