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Finding the Fourth Proportional to 993.74, 1,490.51 and 263.39

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Solution

The fourth proportional to 993.74, 1,490.51 and 263.39 is: 395.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.74 : 1,490.51 = 263.39 : x
  2. Step 2: Convert to fraction form
    993.74/1,490.51 = 263.39/x
  3. Step 3: Cross multiply
    993.74x = 1,490.51 × 263.39
  4. Step 4: Simplify right side
    993.74x = 392,589.81
  5. Step 5: Solve for x
    x = 392,589.81/993.74
  6. Step 6: Final answer
    x = 395.06

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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.