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Finding the Fourth Proportional to 993.42, 1,490.11 and 263.05

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Solution

The fourth proportional to 993.42, 1,490.11 and 263.05 is: 394.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.42 : 1,490.11 = 263.05 : x
  2. Step 2: Convert to fraction form
    993.42/1,490.11 = 263.05/x
  3. Step 3: Cross multiply
    993.42x = 1,490.11 × 263.05
  4. Step 4: Simplify right side
    993.42x = 391,969.05
  5. Step 5: Solve for x
    x = 391,969.05/993.42
  6. Step 6: Final answer
    x = 394.57

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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.