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Finding the Fourth Proportional to 922.56, 1,382.80 and 429.28

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Solution

The fourth proportional to 922.56, 1,382.80 and 429.28 is: 643.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.56 : 1,382.80 = 429.28 : x
  2. Step 2: Convert to fraction form
    922.56/1,382.80 = 429.28/x
  3. Step 3: Cross multiply
    922.56x = 1,382.80 × 429.28
  4. Step 4: Simplify right side
    922.56x = 593,608.38
  5. Step 5: Solve for x
    x = 593,608.38/922.56
  6. Step 6: Final answer
    x = 643.44

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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.