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Finding the Fourth Proportional to 621.87, 858.87 and 483.66

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Solution

The fourth proportional to 621.87, 858.87 and 483.66 is: 667.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.87 : 858.87 = 483.66 : x
  2. Step 2: Convert to fraction form
    621.87/858.87 = 483.66/x
  3. Step 3: Cross multiply
    621.87x = 858.87 × 483.66
  4. Step 4: Simplify right side
    621.87x = 415,401.06
  5. Step 5: Solve for x
    x = 415,401.06/621.87
  6. Step 6: Final answer
    x = 667.99

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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.