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Finding the Fourth Proportional to 993.10, 1,488.48 and 408.08

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Solution

The fourth proportional to 993.10, 1,488.48 and 408.08 is: 611.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.10 : 1,488.48 = 408.08 : x
  2. Step 2: Convert to fraction form
    993.10/1,488.48 = 408.08/x
  3. Step 3: Cross multiply
    993.10x = 1,488.48 × 408.08
  4. Step 4: Simplify right side
    993.10x = 607,418.92
  5. Step 5: Solve for x
    x = 607,418.92/993.10
  6. Step 6: Final answer
    x = 611.64

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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.