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Finding the Fourth Proportional to 3,331.05, 4,995.90 and 990.51

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Solution

The fourth proportional to 3,331.05, 4,995.90 and 990.51 is: 1,485.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,331.05 : 4,995.90 = 990.51 : x
  2. Step 2: Convert to fraction form
    3,331.05/4,995.90 = 990.51/x
  3. Step 3: Cross multiply
    3,331.05x = 4,995.90 × 990.51
  4. Step 4: Simplify right side
    3,331.05x = 4,948,488.91
  5. Step 5: Solve for x
    x = 4,948,488.91/3,331.05
  6. Step 6: Final answer
    x = 1,485.56

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.