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Finding the Fourth Proportional to 616.35, 851.15 and 420.44

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Solution

The fourth proportional to 616.35, 851.15 and 420.44 is: 580.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.35 : 851.15 = 420.44 : x
  2. Step 2: Convert to fraction form
    616.35/851.15 = 420.44/x
  3. Step 3: Cross multiply
    616.35x = 851.15 × 420.44
  4. Step 4: Simplify right side
    616.35x = 357,851.15
  5. Step 5: Solve for x
    x = 357,851.15/616.35
  6. Step 6: Final answer
    x = 580.60

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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.