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Finding the Fourth Proportional to 905.34, 1,249.05 and 551.15

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Solution

The fourth proportional to 905.34, 1,249.05 and 551.15 is: 760.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.34 : 1,249.05 = 551.15 : x
  2. Step 2: Convert to fraction form
    905.34/1,249.05 = 551.15/x
  3. Step 3: Cross multiply
    905.34x = 1,249.05 × 551.15
  4. Step 4: Simplify right side
    905.34x = 688,413.91
  5. Step 5: Solve for x
    x = 688,413.91/905.34
  6. Step 6: Final answer
    x = 760.39

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Double scale
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1.5x scale

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.