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Finding the Fourth Proportional to 993.58, 1,490.16 and 445.21

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Solution

The fourth proportional to 993.58, 1,490.16 and 445.21 is: 667.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.58 : 1,490.16 = 445.21 : x
  2. Step 2: Convert to fraction form
    993.58/1,490.16 = 445.21/x
  3. Step 3: Cross multiply
    993.58x = 1,490.16 × 445.21
  4. Step 4: Simplify right side
    993.58x = 663,434.13
  5. Step 5: Solve for x
    x = 663,434.13/993.58
  6. Step 6: Final answer
    x = 667.72

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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.