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Finding the Fourth Proportional to 989.62, 1,484.91 and 496.54

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Solution

The fourth proportional to 989.62, 1,484.91 and 496.54 is: 745.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.62 : 1,484.91 = 496.54 : x
  2. Step 2: Convert to fraction form
    989.62/1,484.91 = 496.54/x
  3. Step 3: Cross multiply
    989.62x = 1,484.91 × 496.54
  4. Step 4: Simplify right side
    989.62x = 737,317.21
  5. Step 5: Solve for x
    x = 737,317.21/989.62
  6. Step 6: Final answer
    x = 745.05

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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.