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Finding the Fourth Proportional to 993.74, 1,490.06 and 408.42

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Solution

The fourth proportional to 993.74, 1,490.06 and 408.42 is: 612.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.74 : 1,490.06 = 408.42 : x
  2. Step 2: Convert to fraction form
    993.74/1,490.06 = 408.42/x
  3. Step 3: Cross multiply
    993.74x = 1,490.06 × 408.42
  4. Step 4: Simplify right side
    993.74x = 608,570.31
  5. Step 5: Solve for x
    x = 608,570.31/993.74
  6. Step 6: Final answer
    x = 612.40

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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.