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Finding the Fourth Proportional to 553.57, 762.99 and 387.48

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Solution

The fourth proportional to 553.57, 762.99 and 387.48 is: 534.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.57 : 762.99 = 387.48 : x
  2. Step 2: Convert to fraction form
    553.57/762.99 = 387.48/x
  3. Step 3: Cross multiply
    553.57x = 762.99 × 387.48
  4. Step 4: Simplify right side
    553.57x = 295,644.77
  5. Step 5: Solve for x
    x = 295,644.77/553.57
  6. Step 6: Final answer
    x = 534.07

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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.