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Finding the Fourth Proportional to 553.40, 763.49 and 343.35

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Solution

The fourth proportional to 553.40, 763.49 and 343.35 is: 473.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.40 : 763.49 = 343.35 : x
  2. Step 2: Convert to fraction form
    553.40/763.49 = 343.35/x
  3. Step 3: Cross multiply
    553.40x = 763.49 × 343.35
  4. Step 4: Simplify right side
    553.40x = 262,144.29
  5. Step 5: Solve for x
    x = 262,144.29/553.40
  6. Step 6: Final answer
    x = 473.70

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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.