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Finding the Fourth Proportional to 620.98, 931.70 and 447.85

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Solution

The fourth proportional to 620.98, 931.70 and 447.85 is: 671.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.98 : 931.70 = 447.85 : x
  2. Step 2: Convert to fraction form
    620.98/931.70 = 447.85/x
  3. Step 3: Cross multiply
    620.98x = 931.70 × 447.85
  4. Step 4: Simplify right side
    620.98x = 417,257.19
  5. Step 5: Solve for x
    x = 417,257.19/620.98
  6. Step 6: Final answer
    x = 671.93

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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.