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Finding the Fourth Proportional to 617.54, 851.22 and 420.72

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Solution

The fourth proportional to 617.54, 851.22 and 420.72 is: 579.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.54 : 851.22 = 420.72 : x
  2. Step 2: Convert to fraction form
    617.54/851.22 = 420.72/x
  3. Step 3: Cross multiply
    617.54x = 851.22 × 420.72
  4. Step 4: Simplify right side
    617.54x = 358,125.28
  5. Step 5: Solve for x
    x = 358,125.28/617.54
  6. Step 6: Final answer
    x = 579.92

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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.