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Finding the Fourth Proportional to 639.88, 959.94 and 315.08

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Solution

The fourth proportional to 639.88, 959.94 and 315.08 is: 472.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.88 : 959.94 = 315.08 : x
  2. Step 2: Convert to fraction form
    639.88/959.94 = 315.08/x
  3. Step 3: Cross multiply
    639.88x = 959.94 × 315.08
  4. Step 4: Simplify right side
    639.88x = 302,457.90
  5. Step 5: Solve for x
    x = 302,457.90/639.88
  6. Step 6: Final answer
    x = 472.68

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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.