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Finding the Fourth Proportional to 905.03, 1,248.83 and 511.98

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Solution

The fourth proportional to 905.03, 1,248.83 and 511.98 is: 706.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.03 : 1,248.83 = 511.98 : x
  2. Step 2: Convert to fraction form
    905.03/1,248.83 = 511.98/x
  3. Step 3: Cross multiply
    905.03x = 1,248.83 × 511.98
  4. Step 4: Simplify right side
    905.03x = 639,375.98
  5. Step 5: Solve for x
    x = 639,375.98/905.03
  6. Step 6: Final answer
    x = 706.47

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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.