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Finding the Fourth Proportional to 905.75, 1,356.28 and 776.58

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Solution

The fourth proportional to 905.75, 1,356.28 and 776.58 is: 1,162.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.75 : 1,356.28 = 776.58 : x
  2. Step 2: Convert to fraction form
    905.75/1,356.28 = 776.58/x
  3. Step 3: Cross multiply
    905.75x = 1,356.28 × 776.58
  4. Step 4: Simplify right side
    905.75x = 1,053,259.92
  5. Step 5: Solve for x
    x = 1,053,259.92/905.75
  6. Step 6: Final answer
    x = 1,162.86

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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.