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Finding the Fourth Proportional to 905.28, 1,356.28 and 685.48

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Solution

The fourth proportional to 905.28, 1,356.28 and 685.48 is: 1,026.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.28 : 1,356.28 = 685.48 : x
  2. Step 2: Convert to fraction form
    905.28/1,356.28 = 685.48/x
  3. Step 3: Cross multiply
    905.28x = 1,356.28 × 685.48
  4. Step 4: Simplify right side
    905.28x = 929,702.81
  5. Step 5: Solve for x
    x = 929,702.81/905.28
  6. Step 6: Final answer
    x = 1,026.98

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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.