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Finding the Fourth Proportional to 942.12, 1,299.90 and 549.09

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Solution

The fourth proportional to 942.12, 1,299.90 and 549.09 is: 757.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.12 : 1,299.90 = 549.09 : x
  2. Step 2: Convert to fraction form
    942.12/1,299.90 = 549.09/x
  3. Step 3: Cross multiply
    942.12x = 1,299.90 × 549.09
  4. Step 4: Simplify right side
    942.12x = 713,762.09
  5. Step 5: Solve for x
    x = 713,762.09/942.12
  6. Step 6: Final answer
    x = 757.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.