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Finding the Fourth Proportional to 899.40, 1,240.38 and 549.84

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Solution

The fourth proportional to 899.40, 1,240.38 and 549.84 is: 758.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.40 : 1,240.38 = 549.84 : x
  2. Step 2: Convert to fraction form
    899.40/1,240.38 = 549.84/x
  3. Step 3: Cross multiply
    899.40x = 1,240.38 × 549.84
  4. Step 4: Simplify right side
    899.40x = 682,010.54
  5. Step 5: Solve for x
    x = 682,010.54/899.40
  6. Step 6: Final answer
    x = 758.30

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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.