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Finding the Fourth Proportional to 620.80, 931.21 and 504.70

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Solution

The fourth proportional to 620.80, 931.21 and 504.70 is: 757.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.80 : 931.21 = 504.70 : x
  2. Step 2: Convert to fraction form
    620.80/931.21 = 504.70/x
  3. Step 3: Cross multiply
    620.80x = 931.21 × 504.70
  4. Step 4: Simplify right side
    620.80x = 469,978.10
  5. Step 5: Solve for x
    x = 469,978.10/620.80
  6. Step 6: Final answer
    x = 757.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.