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Finding the Fourth Proportional to 905.96, 1,356.84 and 661.88

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Solution

The fourth proportional to 905.96, 1,356.84 and 661.88 is: 991.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.96 : 1,356.84 = 661.88 : x
  2. Step 2: Convert to fraction form
    905.96/1,356.84 = 661.88/x
  3. Step 3: Cross multiply
    905.96x = 1,356.84 × 661.88
  4. Step 4: Simplify right side
    905.96x = 898,058.48
  5. Step 5: Solve for x
    x = 898,058.48/905.96
  6. Step 6: Final answer
    x = 991.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.