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Finding the Fourth Proportional to 993.88, 1,490.78 and 263.44

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Solution

The fourth proportional to 993.88, 1,490.78 and 263.44 is: 395.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.88 : 1,490.78 = 263.44 : x
  2. Step 2: Convert to fraction form
    993.88/1,490.78 = 263.44/x
  3. Step 3: Cross multiply
    993.88x = 1,490.78 × 263.44
  4. Step 4: Simplify right side
    993.88x = 392,731.08
  5. Step 5: Solve for x
    x = 392,731.08/993.88
  6. Step 6: Final answer
    x = 395.15

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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.