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Finding the Fourth Proportional to 794.88, 1,190.64 and 639.84

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Solution

The fourth proportional to 794.88, 1,190.64 and 639.84 is: 958.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    794.88 : 1,190.64 = 639.84 : x
  2. Step 2: Convert to fraction form
    794.88/1,190.64 = 639.84/x
  3. Step 3: Cross multiply
    794.88x = 1,190.64 × 639.84
  4. Step 4: Simplify right side
    794.88x = 761,819.10
  5. Step 5: Solve for x
    x = 761,819.10/794.88
  6. Step 6: Final answer
    x = 958.41

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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.