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Finding the Fourth Proportional to 792.76, 1,188.74 and 427.26

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Solution

The fourth proportional to 792.76, 1,188.74 and 427.26 is: 640.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.76 : 1,188.74 = 427.26 : x
  2. Step 2: Convert to fraction form
    792.76/1,188.74 = 427.26/x
  3. Step 3: Cross multiply
    792.76x = 1,188.74 × 427.26
  4. Step 4: Simplify right side
    792.76x = 507,901.05
  5. Step 5: Solve for x
    x = 507,901.05/792.76
  6. Step 6: Final answer
    x = 640.67

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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.