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Finding the Fourth Proportional to 792.20, 1,188.36 and 305.16

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Solution

The fourth proportional to 792.20, 1,188.36 and 305.16 is: 457.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.20 : 1,188.36 = 305.16 : x
  2. Step 2: Convert to fraction form
    792.20/1,188.36 = 305.16/x
  3. Step 3: Cross multiply
    792.20x = 1,188.36 × 305.16
  4. Step 4: Simplify right side
    792.20x = 362,639.94
  5. Step 5: Solve for x
    x = 362,639.94/792.20
  6. Step 6: Final answer
    x = 457.77

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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.