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Finding the Fourth Proportional to 993.48, 1,490.22 and 445.54

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Solution

The fourth proportional to 993.48, 1,490.22 and 445.54 is: 668.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.48 : 1,490.22 = 445.54 : x
  2. Step 2: Convert to fraction form
    993.48/1,490.22 = 445.54/x
  3. Step 3: Cross multiply
    993.48x = 1,490.22 × 445.54
  4. Step 4: Simplify right side
    993.48x = 663,952.62
  5. Step 5: Solve for x
    x = 663,952.62/993.48
  6. Step 6: Final answer
    x = 668.31

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Double scale
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Similar ratio
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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.