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Finding the Fourth Proportional to 1,115.94, 1,671.48 and 681.78

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Solution

The fourth proportional to 1,115.94, 1,671.48 and 681.78 is: 1,021.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.94 : 1,671.48 = 681.78 : x
  2. Step 2: Convert to fraction form
    1,115.94/1,671.48 = 681.78/x
  3. Step 3: Cross multiply
    1,115.94x = 1,671.48 × 681.78
  4. Step 4: Simplify right side
    1,115.94x = 1,139,581.63
  5. Step 5: Solve for x
    x = 1,139,581.63/1,115.94
  6. Step 6: Final answer
    x = 1,021.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.