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Finding the Fourth Proportional to 783.44, 1,081.12 and 451.92

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Solution

The fourth proportional to 783.44, 1,081.12 and 451.92 is: 623.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.44 : 1,081.12 = 451.92 : x
  2. Step 2: Convert to fraction form
    783.44/1,081.12 = 451.92/x
  3. Step 3: Cross multiply
    783.44x = 1,081.12 × 451.92
  4. Step 4: Simplify right side
    783.44x = 488,579.75
  5. Step 5: Solve for x
    x = 488,579.75/783.44
  6. Step 6: Final answer
    x = 623.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.