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Finding the Fourth Proportional to 621.53, 857.97 and 419.68

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Solution

The fourth proportional to 621.53, 857.97 and 419.68 is: 579.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.53 : 857.97 = 419.68 : x
  2. Step 2: Convert to fraction form
    621.53/857.97 = 419.68/x
  3. Step 3: Cross multiply
    621.53x = 857.97 × 419.68
  4. Step 4: Simplify right side
    621.53x = 360,066.46
  5. Step 5: Solve for x
    x = 360,066.46/621.53
  6. Step 6: Final answer
    x = 579.33

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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.