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Finding the Fourth Proportional to 657.20, 905.96 and 551.50

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Solution

The fourth proportional to 657.20, 905.96 and 551.50 is: 760.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.20 : 905.96 = 551.50 : x
  2. Step 2: Convert to fraction form
    657.20/905.96 = 551.50/x
  3. Step 3: Cross multiply
    657.20x = 905.96 × 551.50
  4. Step 4: Simplify right side
    657.20x = 499,636.94
  5. Step 5: Solve for x
    x = 499,636.94/657.20
  6. Step 6: Final answer
    x = 760.25

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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.