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Finding the Fourth Proportional to 639.95, 957.49 and 395.87

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Solution

The fourth proportional to 639.95, 957.49 and 395.87 is: 592.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.95 : 957.49 = 395.87 : x
  2. Step 2: Convert to fraction form
    639.95/957.49 = 395.87/x
  3. Step 3: Cross multiply
    639.95x = 957.49 × 395.87
  4. Step 4: Simplify right side
    639.95x = 379,035.79
  5. Step 5: Solve for x
    x = 379,035.79/639.95
  6. Step 6: Final answer
    x = 592.29

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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.