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Finding the Fourth Proportional to 783.74, 1,081.31 and 452.12

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Solution

The fourth proportional to 783.74, 1,081.31 and 452.12 is: 623.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.74 : 1,081.31 = 452.12 : x
  2. Step 2: Convert to fraction form
    783.74/1,081.31 = 452.12/x
  3. Step 3: Cross multiply
    783.74x = 1,081.31 × 452.12
  4. Step 4: Simplify right side
    783.74x = 488,885.71
  5. Step 5: Solve for x
    x = 488,885.71/783.74
  6. Step 6: Final answer
    x = 623.78

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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.