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Finding the Fourth Proportional to 922.61, 1,272.16 and 673.49

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Solution

The fourth proportional to 922.61, 1,272.16 and 673.49 is: 928.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.61 : 1,272.16 = 673.49 : x
  2. Step 2: Convert to fraction form
    922.61/1,272.16 = 673.49/x
  3. Step 3: Cross multiply
    922.61x = 1,272.16 × 673.49
  4. Step 4: Simplify right side
    922.61x = 856,787.04
  5. Step 5: Solve for x
    x = 856,787.04/922.61
  6. Step 6: Final answer
    x = 928.66

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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.