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Finding the Fourth Proportional to 621.08, 929.57 and 518.57

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Solution

The fourth proportional to 621.08, 929.57 and 518.57 is: 776.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.08 : 929.57 = 518.57 : x
  2. Step 2: Convert to fraction form
    621.08/929.57 = 518.57/x
  3. Step 3: Cross multiply
    621.08x = 929.57 × 518.57
  4. Step 4: Simplify right side
    621.08x = 482,039.87
  5. Step 5: Solve for x
    x = 482,039.87/621.08
  6. Step 6: Final answer
    x = 776.14

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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.