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Finding the Fourth Proportional to 989.49, 1,484.81 and 404.40

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Solution

The fourth proportional to 989.49, 1,484.81 and 404.40 is: 606.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.49 : 1,484.81 = 404.40 : x
  2. Step 2: Convert to fraction form
    989.49/1,484.81 = 404.40/x
  3. Step 3: Cross multiply
    989.49x = 1,484.81 × 404.40
  4. Step 4: Simplify right side
    989.49x = 600,457.16
  5. Step 5: Solve for x
    x = 600,457.16/989.49
  6. Step 6: Final answer
    x = 606.83

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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.