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Finding the Fourth Proportional to 783.45, 1,081.07 and 451.86

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Solution

The fourth proportional to 783.45, 1,081.07 and 451.86 is: 623.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.45 : 1,081.07 = 451.86 : x
  2. Step 2: Convert to fraction form
    783.45/1,081.07 = 451.86/x
  3. Step 3: Cross multiply
    783.45x = 1,081.07 × 451.86
  4. Step 4: Simplify right side
    783.45x = 488,490.03
  5. Step 5: Solve for x
    x = 488,490.03/783.45
  6. Step 6: Final answer
    x = 623.51

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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.