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Finding the Fourth Proportional to 911.51, 1,257.68 and 538.23

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Solution

The fourth proportional to 911.51, 1,257.68 and 538.23 is: 742.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.51 : 1,257.68 = 538.23 : x
  2. Step 2: Convert to fraction form
    911.51/1,257.68 = 538.23/x
  3. Step 3: Cross multiply
    911.51x = 1,257.68 × 538.23
  4. Step 4: Simplify right side
    911.51x = 676,918.42
  5. Step 5: Solve for x
    x = 676,918.42/911.51
  6. Step 6: Final answer
    x = 742.64

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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.