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Finding the Fourth Proportional to 905.10, 1,248.78 and 512.11

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Solution

The fourth proportional to 905.10, 1,248.78 and 512.11 is: 706.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.10 : 1,248.78 = 512.11 : x
  2. Step 2: Convert to fraction form
    905.10/1,248.78 = 512.11/x
  3. Step 3: Cross multiply
    905.10x = 1,248.78 × 512.11
  4. Step 4: Simplify right side
    905.10x = 639,512.73
  5. Step 5: Solve for x
    x = 639,512.73/905.10
  6. Step 6: Final answer
    x = 706.57

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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.