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Finding the Fourth Proportional to 905.75, 1,248.90 and 610.50

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Solution

The fourth proportional to 905.75, 1,248.90 and 610.50 is: 841.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.75 : 1,248.90 = 610.50 : x
  2. Step 2: Convert to fraction form
    905.75/1,248.90 = 610.50/x
  3. Step 3: Cross multiply
    905.75x = 1,248.90 × 610.50
  4. Step 4: Simplify right side
    905.75x = 762,453.45
  5. Step 5: Solve for x
    x = 762,453.45/905.75
  6. Step 6: Final answer
    x = 841.80

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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.