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Finding the Fourth Proportional to 553.38, 763 and 478.56

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Solution

The fourth proportional to 553.38, 763 and 478.56 is: 659.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.38 : 763 = 478.56 : x
  2. Step 2: Convert to fraction form
    553.38/763 = 478.56/x
  3. Step 3: Cross multiply
    553.38x = 763 × 478.56
  4. Step 4: Simplify right side
    553.38x = 365,141.28
  5. Step 5: Solve for x
    x = 365,141.28/553.38
  6. Step 6: Final answer
    x = 659.84

Related Problems

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Double scale
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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.