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Finding the Fourth Proportional to 610.02, 839.97 and 485.28

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Solution

The fourth proportional to 610.02, 839.97 and 485.28 is: 668.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.02 : 839.97 = 485.28 : x
  2. Step 2: Convert to fraction form
    610.02/839.97 = 485.28/x
  3. Step 3: Cross multiply
    610.02x = 839.97 × 485.28
  4. Step 4: Simplify right side
    610.02x = 407,620.64
  5. Step 5: Solve for x
    x = 407,620.64/610.02
  6. Step 6: Final answer
    x = 668.21

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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.