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Finding the Fourth Proportional to 922.38, 1,272.29 and 656.79

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Solution

The fourth proportional to 922.38, 1,272.29 and 656.79 is: 905.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.38 : 1,272.29 = 656.79 : x
  2. Step 2: Convert to fraction form
    922.38/1,272.29 = 656.79/x
  3. Step 3: Cross multiply
    922.38x = 1,272.29 × 656.79
  4. Step 4: Simplify right side
    922.38x = 835,624.07
  5. Step 5: Solve for x
    x = 835,624.07/922.38
  6. Step 6: Final answer
    x = 905.94

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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.