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Finding the Fourth Proportional to 611.40, 917.10 and 546.60

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Solution

The fourth proportional to 611.40, 917.10 and 546.60 is: 819.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.40 : 917.10 = 546.60 : x
  2. Step 2: Convert to fraction form
    611.40/917.10 = 546.60/x
  3. Step 3: Cross multiply
    611.40x = 917.10 × 546.60
  4. Step 4: Simplify right side
    611.40x = 501,286.86
  5. Step 5: Solve for x
    x = 501,286.86/611.40
  6. Step 6: Final answer
    x = 819.90

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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.