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Finding the Fourth Proportional to 611.31, 917.10 and 286.50

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Solution

The fourth proportional to 611.31, 917.10 and 286.50 is: 429.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.31 : 917.10 = 286.50 : x
  2. Step 2: Convert to fraction form
    611.31/917.10 = 286.50/x
  3. Step 3: Cross multiply
    611.31x = 917.10 × 286.50
  4. Step 4: Simplify right side
    611.31x = 262,749.15
  5. Step 5: Solve for x
    x = 262,749.15/611.31
  6. Step 6: Final answer
    x = 429.81

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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.