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Finding the Fourth Proportional to 639.16, 957.33 and 621.94

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Solution

The fourth proportional to 639.16, 957.33 and 621.94 is: 931.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.16 : 957.33 = 621.94 : x
  2. Step 2: Convert to fraction form
    639.16/957.33 = 621.94/x
  3. Step 3: Cross multiply
    639.16x = 957.33 × 621.94
  4. Step 4: Simplify right side
    639.16x = 595,401.82
  5. Step 5: Solve for x
    x = 595,401.82/639.16
  6. Step 6: Final answer
    x = 931.54

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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.