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Finding the Fourth Proportional to 863.90, 1,295.85 and 518.30

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Solution

The fourth proportional to 863.90, 1,295.85 and 518.30 is: 777.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.90 : 1,295.85 = 518.30 : x
  2. Step 2: Convert to fraction form
    863.90/1,295.85 = 518.30/x
  3. Step 3: Cross multiply
    863.90x = 1,295.85 × 518.30
  4. Step 4: Simplify right side
    863.90x = 671,639.06
  5. Step 5: Solve for x
    x = 671,639.06/863.90
  6. Step 6: Final answer
    x = 777.45

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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.