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Finding the Fourth Proportional to 561.29, 839.97 and 485.15

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Solution

The fourth proportional to 561.29, 839.97 and 485.15 is: 726.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.29 : 839.97 = 485.15 : x
  2. Step 2: Convert to fraction form
    561.29/839.97 = 485.15/x
  3. Step 3: Cross multiply
    561.29x = 839.97 × 485.15
  4. Step 4: Simplify right side
    561.29x = 407,507.25
  5. Step 5: Solve for x
    x = 407,507.25/561.29
  6. Step 6: Final answer
    x = 726.03

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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.