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Finding the Fourth Proportional to 792.41, 1,188.63 and 638.70

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Solution

The fourth proportional to 792.41, 1,188.63 and 638.70 is: 958.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.41 : 1,188.63 = 638.70 : x
  2. Step 2: Convert to fraction form
    792.41/1,188.63 = 638.70/x
  3. Step 3: Cross multiply
    792.41x = 1,188.63 × 638.70
  4. Step 4: Simplify right side
    792.41x = 759,177.98
  5. Step 5: Solve for x
    x = 759,177.98/792.41
  6. Step 6: Final answer
    x = 958.07

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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.