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Finding the Fourth Proportional to 553.87, 764.34 and 305.19

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Solution

The fourth proportional to 553.87, 764.34 and 305.19 is: 421.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.87 : 764.34 = 305.19 : x
  2. Step 2: Convert to fraction form
    553.87/764.34 = 305.19/x
  3. Step 3: Cross multiply
    553.87x = 764.34 × 305.19
  4. Step 4: Simplify right side
    553.87x = 233,272.94
  5. Step 5: Solve for x
    x = 233,272.94/553.87
  6. Step 6: Final answer
    x = 421.17

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1.5x scale

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.