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Finding the Fourth Proportional to 617.36, 850.80 and 477.20

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Solution

The fourth proportional to 617.36, 850.80 and 477.20 is: 657.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.36 : 850.80 = 477.20 : x
  2. Step 2: Convert to fraction form
    617.36/850.80 = 477.20/x
  3. Step 3: Cross multiply
    617.36x = 850.80 × 477.20
  4. Step 4: Simplify right side
    617.36x = 406,001.76
  5. Step 5: Solve for x
    x = 406,001.76/617.36
  6. Step 6: Final answer
    x = 657.64

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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.