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Finding the Fourth Proportional to 611.54, 917.21 and 178.59

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Solution

The fourth proportional to 611.54, 917.21 and 178.59 is: 267.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.54 : 917.21 = 178.59 : x
  2. Step 2: Convert to fraction form
    611.54/917.21 = 178.59/x
  3. Step 3: Cross multiply
    611.54x = 917.21 × 178.59
  4. Step 4: Simplify right side
    611.54x = 163,803.64
  5. Step 5: Solve for x
    x = 163,803.64/611.54
  6. Step 6: Final answer
    x = 267.86

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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.