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Finding the Fourth Proportional to 990.50, 1,486.62 and 443.12

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Solution

The fourth proportional to 990.50, 1,486.62 and 443.12 is: 665.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.50 : 1,486.62 = 443.12 : x
  2. Step 2: Convert to fraction form
    990.50/1,486.62 = 443.12/x
  3. Step 3: Cross multiply
    990.50x = 1,486.62 × 443.12
  4. Step 4: Simplify right side
    990.50x = 658,743.62
  5. Step 5: Solve for x
    x = 658,743.62/990.50
  6. Step 6: Final answer
    x = 665.07

Related Problems

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Double scale
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1.5x scale

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.