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Finding the Fourth Proportional to 917.18, 1,265.48 and 518.84

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Solution

The fourth proportional to 917.18, 1,265.48 and 518.84 is: 715.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.18 : 1,265.48 = 518.84 : x
  2. Step 2: Convert to fraction form
    917.18/1,265.48 = 518.84/x
  3. Step 3: Cross multiply
    917.18x = 1,265.48 × 518.84
  4. Step 4: Simplify right side
    917.18x = 656,579.05
  5. Step 5: Solve for x
    x = 656,579.05/917.18
  6. Step 6: Final answer
    x = 715.87

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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.