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Finding the Fourth Proportional to 922.46, 1,383.58 and 428.56

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Solution

The fourth proportional to 922.46, 1,383.58 and 428.56 is: 642.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.46 : 1,383.58 = 428.56 : x
  2. Step 2: Convert to fraction form
    922.46/1,383.58 = 428.56/x
  3. Step 3: Cross multiply
    922.46x = 1,383.58 × 428.56
  4. Step 4: Simplify right side
    922.46x = 592,944.12
  5. Step 5: Solve for x
    x = 592,944.12/922.46
  6. Step 6: Final answer
    x = 642.79

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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.