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Finding the Fourth Proportional to 993.50, 1,490.93 and 985.81

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Solution

The fourth proportional to 993.50, 1,490.93 and 985.81 is: 1,479.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.50 : 1,490.93 = 985.81 : x
  2. Step 2: Convert to fraction form
    993.50/1,490.93 = 985.81/x
  3. Step 3: Cross multiply
    993.50x = 1,490.93 × 985.81
  4. Step 4: Simplify right side
    993.50x = 1,469,772.44
  5. Step 5: Solve for x
    x = 1,469,772.44/993.50
  6. Step 6: Final answer
    x = 1,479.40

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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.