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Finding the Fourth Proportional to 553.97, 763.88 and 388.13

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Solution

The fourth proportional to 553.97, 763.88 and 388.13 is: 535.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.97 : 763.88 = 388.13 : x
  2. Step 2: Convert to fraction form
    553.97/763.88 = 388.13/x
  3. Step 3: Cross multiply
    553.97x = 763.88 × 388.13
  4. Step 4: Simplify right side
    553.97x = 296,478.98
  5. Step 5: Solve for x
    x = 296,478.98/553.97
  6. Step 6: Final answer
    x = 535.19

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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.