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Finding the Fourth Proportional to 616.17, 850.62 and 420.71

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Solution

The fourth proportional to 616.17, 850.62 and 420.71 is: 580.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.17 : 850.62 = 420.71 : x
  2. Step 2: Convert to fraction form
    616.17/850.62 = 420.71/x
  3. Step 3: Cross multiply
    616.17x = 850.62 × 420.71
  4. Step 4: Simplify right side
    616.17x = 357,860.09
  5. Step 5: Solve for x
    x = 357,860.09/616.17
  6. Step 6: Final answer
    x = 580.78

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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.