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Finding the Fourth Proportional to 989.54, 1,484.82 and 404.98

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Solution

The fourth proportional to 989.54, 1,484.82 and 404.98 is: 607.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.54 : 1,484.82 = 404.98 : x
  2. Step 2: Convert to fraction form
    989.54/1,484.82 = 404.98/x
  3. Step 3: Cross multiply
    989.54x = 1,484.82 × 404.98
  4. Step 4: Simplify right side
    989.54x = 601,313.97
  5. Step 5: Solve for x
    x = 601,313.97/989.54
  6. Step 6: Final answer
    x = 607.67

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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.