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Finding the Fourth Proportional to 549.06, 756.91 and 391.63

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Solution

The fourth proportional to 549.06, 756.91 and 391.63 is: 539.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.06 : 756.91 = 391.63 : x
  2. Step 2: Convert to fraction form
    549.06/756.91 = 391.63/x
  3. Step 3: Cross multiply
    549.06x = 756.91 × 391.63
  4. Step 4: Simplify right side
    549.06x = 296,428.66
  5. Step 5: Solve for x
    x = 296,428.66/549.06
  6. Step 6: Final answer
    x = 539.88

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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.