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Finding the Fourth Proportional to 990.25, 1,484.88 and 331.90

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Solution

The fourth proportional to 990.25, 1,484.88 and 331.90 is: 497.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.25 : 1,484.88 = 331.90 : x
  2. Step 2: Convert to fraction form
    990.25/1,484.88 = 331.90/x
  3. Step 3: Cross multiply
    990.25x = 1,484.88 × 331.90
  4. Step 4: Simplify right side
    990.25x = 492,826.72
  5. Step 5: Solve for x
    x = 492,826.72/990.25
  6. Step 6: Final answer
    x = 497.68

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Half scale
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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.