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Finding the Fourth Proportional to 553.92, 763.92 and 420.96

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Solution

The fourth proportional to 553.92, 763.92 and 420.96 is: 580.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.92 : 763.92 = 420.96 : x
  2. Step 2: Convert to fraction form
    553.92/763.92 = 420.96/x
  3. Step 3: Cross multiply
    553.92x = 763.92 × 420.96
  4. Step 4: Simplify right side
    553.92x = 321,579.76
  5. Step 5: Solve for x
    x = 321,579.76/553.92
  6. Step 6: Final answer
    x = 580.55

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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.