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Finding the Fourth Proportional to 553.26, 762.72 and 395.40

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Solution

The fourth proportional to 553.26, 762.72 and 395.40 is: 545.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.26 : 762.72 = 395.40 : x
  2. Step 2: Convert to fraction form
    553.26/762.72 = 395.40/x
  3. Step 3: Cross multiply
    553.26x = 762.72 × 395.40
  4. Step 4: Simplify right side
    553.26x = 301,579.49
  5. Step 5: Solve for x
    x = 301,579.49/553.26
  6. Step 6: Final answer
    x = 545.10

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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.