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Finding the Fourth Proportional to 450.45, 620.85 and 317.72

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Solution

The fourth proportional to 450.45, 620.85 and 317.72 is: 437.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.45 : 620.85 = 317.72 : x
  2. Step 2: Convert to fraction form
    450.45/620.85 = 317.72/x
  3. Step 3: Cross multiply
    450.45x = 620.85 × 317.72
  4. Step 4: Simplify right side
    450.45x = 197,256.46
  5. Step 5: Solve for x
    x = 197,256.46/450.45
  6. Step 6: Final answer
    x = 437.91

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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.