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Finding the Fourth Proportional to 783.42, 1,081.05 and 451.79

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Solution

The fourth proportional to 783.42, 1,081.05 and 451.79 is: 623.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.42 : 1,081.05 = 451.79 : x
  2. Step 2: Convert to fraction form
    783.42/1,081.05 = 451.79/x
  3. Step 3: Cross multiply
    783.42x = 1,081.05 × 451.79
  4. Step 4: Simplify right side
    783.42x = 488,407.58
  5. Step 5: Solve for x
    x = 488,407.58/783.42
  6. Step 6: Final answer
    x = 623.43

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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.