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Finding the Fourth Proportional to 609.90, 915 and 177.09

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Solution

The fourth proportional to 609.90, 915 and 177.09 is: 265.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.90 : 915 = 177.09 : x
  2. Step 2: Convert to fraction form
    609.90/915 = 177.09/x
  3. Step 3: Cross multiply
    609.90x = 915 × 177.09
  4. Step 4: Simplify right side
    609.90x = 162,037.35
  5. Step 5: Solve for x
    x = 162,037.35/609.90
  6. Step 6: Final answer
    x = 265.68

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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.