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Finding the Fourth Proportional to 553.10, 763.12 and 320.22

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Solution

The fourth proportional to 553.10, 763.12 and 320.22 is: 441.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.10 : 763.12 = 320.22 : x
  2. Step 2: Convert to fraction form
    553.10/763.12 = 320.22/x
  3. Step 3: Cross multiply
    553.10x = 763.12 × 320.22
  4. Step 4: Simplify right side
    553.10x = 244,366.29
  5. Step 5: Solve for x
    x = 244,366.29/553.10
  6. Step 6: Final answer
    x = 441.81

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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.