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Finding the Fourth Proportional to 905.40, 1,242.52 and 847.80

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Solution

The fourth proportional to 905.40, 1,242.52 and 847.80 is: 1,163.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.40 : 1,242.52 = 847.80 : x
  2. Step 2: Convert to fraction form
    905.40/1,242.52 = 847.80/x
  3. Step 3: Cross multiply
    905.40x = 1,242.52 × 847.80
  4. Step 4: Simplify right side
    905.40x = 1,053,408.46
  5. Step 5: Solve for x
    x = 1,053,408.46/905.40
  6. Step 6: Final answer
    x = 1,163.47

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.