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Finding the Fourth Proportional to 553.47, 828.60 and 431.37

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Solution

The fourth proportional to 553.47, 828.60 and 431.37 is: 645.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.47 : 828.60 = 431.37 : x
  2. Step 2: Convert to fraction form
    553.47/828.60 = 431.37/x
  3. Step 3: Cross multiply
    553.47x = 828.60 × 431.37
  4. Step 4: Simplify right side
    553.47x = 357,433.18
  5. Step 5: Solve for x
    x = 357,433.18/553.47
  6. Step 6: Final answer
    x = 645.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.