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Finding the Fourth Proportional to 611.59, 917.40 and 490.09

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Solution

The fourth proportional to 611.59, 917.40 and 490.09 is: 735.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.59 : 917.40 = 490.09 : x
  2. Step 2: Convert to fraction form
    611.59/917.40 = 490.09/x
  3. Step 3: Cross multiply
    611.59x = 917.40 × 490.09
  4. Step 4: Simplify right side
    611.59x = 449,608.57
  5. Step 5: Solve for x
    x = 449,608.57/611.59
  6. Step 6: Final answer
    x = 735.15

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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.