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Finding the Fourth Proportional to 621.99, 856.20 and 496.71

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Solution

The fourth proportional to 621.99, 856.20 and 496.71 is: 683.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.99 : 856.20 = 496.71 : x
  2. Step 2: Convert to fraction form
    621.99/856.20 = 496.71/x
  3. Step 3: Cross multiply
    621.99x = 856.20 × 496.71
  4. Step 4: Simplify right side
    621.99x = 425,283.10
  5. Step 5: Solve for x
    x = 425,283.10/621.99
  6. Step 6: Final answer
    x = 683.75

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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.