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Finding the Fourth Proportional to 905.46, 1,249.58 and 551.32

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Solution

The fourth proportional to 905.46, 1,249.58 and 551.32 is: 760.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.46 : 1,249.58 = 551.32 : x
  2. Step 2: Convert to fraction form
    905.46/1,249.58 = 551.32/x
  3. Step 3: Cross multiply
    905.46x = 1,249.58 × 551.32
  4. Step 4: Simplify right side
    905.46x = 688,920.63
  5. Step 5: Solve for x
    x = 688,920.63/905.46
  6. Step 6: Final answer
    x = 760.85

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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.