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Finding the Fourth Proportional to 783.34, 1,081.11 and 451.91

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Solution

The fourth proportional to 783.34, 1,081.11 and 451.91 is: 623.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.34 : 1,081.11 = 451.91 : x
  2. Step 2: Convert to fraction form
    783.34/1,081.11 = 451.91/x
  3. Step 3: Cross multiply
    783.34x = 1,081.11 × 451.91
  4. Step 4: Simplify right side
    783.34x = 488,568.82
  5. Step 5: Solve for x
    x = 488,568.82/783.34
  6. Step 6: Final answer
    x = 623.70

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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.