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Finding the Fourth Proportional to 553.17, 762.59 and 395.76

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Solution

The fourth proportional to 553.17, 762.59 and 395.76 is: 545.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.17 : 762.59 = 395.76 : x
  2. Step 2: Convert to fraction form
    553.17/762.59 = 395.76/x
  3. Step 3: Cross multiply
    553.17x = 762.59 × 395.76
  4. Step 4: Simplify right side
    553.17x = 301,798.81
  5. Step 5: Solve for x
    x = 301,798.81/553.17
  6. Step 6: Final answer
    x = 545.59

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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.