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Finding the Fourth Proportional to 993.90, 1,491.09 and 705.90

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Solution

The fourth proportional to 993.90, 1,491.09 and 705.90 is: 1,059.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.90 : 1,491.09 = 705.90 : x
  2. Step 2: Convert to fraction form
    993.90/1,491.09 = 705.90/x
  3. Step 3: Cross multiply
    993.90x = 1,491.09 × 705.90
  4. Step 4: Simplify right side
    993.90x = 1,052,560.43
  5. Step 5: Solve for x
    x = 1,052,560.43/993.90
  6. Step 6: Final answer
    x = 1,059.02

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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.