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Finding the Fourth Proportional to 993.89, 1,490.90 and 300.50

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Solution

The fourth proportional to 993.89, 1,490.90 and 300.50 is: 450.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.89 : 1,490.90 = 300.50 : x
  2. Step 2: Convert to fraction form
    993.89/1,490.90 = 300.50/x
  3. Step 3: Cross multiply
    993.89x = 1,490.90 × 300.50
  4. Step 4: Simplify right side
    993.89x = 448,015.45
  5. Step 5: Solve for x
    x = 448,015.45/993.89
  6. Step 6: Final answer
    x = 450.77

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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.