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Finding the Fourth Proportional to 549.75, 757.76 and 390.03

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Solution

The fourth proportional to 549.75, 757.76 and 390.03 is: 537.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.75 : 757.76 = 390.03 : x
  2. Step 2: Convert to fraction form
    549.75/757.76 = 390.03/x
  3. Step 3: Cross multiply
    549.75x = 757.76 × 390.03
  4. Step 4: Simplify right side
    549.75x = 295,544.34
  5. Step 5: Solve for x
    x = 295,544.34/549.75
  6. Step 6: Final answer
    x = 537.59

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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.