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Finding the Fourth Proportional to 639, 958.50 and 291.29

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Solution

The fourth proportional to 639, 958.50 and 291.29 is: 436.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    639 : 958.50 = 291.29 : x
  2. Step 2: Convert to fraction form
    639/958.50 = 291.29/x
  3. Step 3: Cross multiply
    639x = 958.50 × 291.29
  4. Step 4: Simplify right side
    639x = 279,196.67
  5. Step 5: Solve for x
    x = 279,196.67/639
  6. Step 6: Final answer
    x = 436.93

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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.