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Finding the Fourth Proportional to 917.25, 1,265.50 and 518.87

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Solution

The fourth proportional to 917.25, 1,265.50 and 518.87 is: 715.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.25 : 1,265.50 = 518.87 : x
  2. Step 2: Convert to fraction form
    917.25/1,265.50 = 518.87/x
  3. Step 3: Cross multiply
    917.25x = 1,265.50 × 518.87
  4. Step 4: Simplify right side
    917.25x = 656,629.05
  5. Step 5: Solve for x
    x = 656,629.05/917.25
  6. Step 6: Final answer
    x = 715.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.