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Finding the Fourth Proportional to 922.74, 1,272.79 and 549.46

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Solution

The fourth proportional to 922.74, 1,272.79 and 549.46 is: 757.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.74 : 1,272.79 = 549.46 : x
  2. Step 2: Convert to fraction form
    922.74/1,272.79 = 549.46/x
  3. Step 3: Cross multiply
    922.74x = 1,272.79 × 549.46
  4. Step 4: Simplify right side
    922.74x = 699,347.19
  5. Step 5: Solve for x
    x = 699,347.19/922.74
  6. Step 6: Final answer
    x = 757.90

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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.