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Finding the Fourth Proportional to 553.84, 764.50 and 388.54

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Solution

The fourth proportional to 553.84, 764.50 and 388.54 is: 536.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.84 : 764.50 = 388.54 : x
  2. Step 2: Convert to fraction form
    553.84/764.50 = 388.54/x
  3. Step 3: Cross multiply
    553.84x = 764.50 × 388.54
  4. Step 4: Simplify right side
    553.84x = 297,036.89
  5. Step 5: Solve for x
    x = 297,036.89/553.84
  6. Step 6: Final answer
    x = 536.32

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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.