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Finding the Fourth Proportional to 993.33, 1,490.08 and 408.05

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Solution

The fourth proportional to 993.33, 1,490.08 and 408.05 is: 612.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.33 : 1,490.08 = 408.05 : x
  2. Step 2: Convert to fraction form
    993.33/1,490.08 = 408.05/x
  3. Step 3: Cross multiply
    993.33x = 1,490.08 × 408.05
  4. Step 4: Simplify right side
    993.33x = 608,033.41
  5. Step 5: Solve for x
    x = 608,033.41/993.33
  6. Step 6: Final answer
    x = 612.12

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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.