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Finding the Fourth Proportional to 922.48, 1,272.78 and 549.29

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Solution

The fourth proportional to 922.48, 1,272.78 and 549.29 is: 757.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.48 : 1,272.78 = 549.29 : x
  2. Step 2: Convert to fraction form
    922.48/1,272.78 = 549.29/x
  3. Step 3: Cross multiply
    922.48x = 1,272.78 × 549.29
  4. Step 4: Simplify right side
    922.48x = 699,128.51
  5. Step 5: Solve for x
    x = 699,128.51/922.48
  6. Step 6: Final answer
    x = 757.88

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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.