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Finding the Fourth Proportional to 1,411.11, 1,947.40 and 851.74

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Solution

The fourth proportional to 1,411.11, 1,947.40 and 851.74 is: 1,175.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,411.11 : 1,947.40 = 851.74 : x
  2. Step 2: Convert to fraction form
    1,411.11/1,947.40 = 851.74/x
  3. Step 3: Cross multiply
    1,411.11x = 1,947.40 × 851.74
  4. Step 4: Simplify right side
    1,411.11x = 1,658,671.48
  5. Step 5: Solve for x
    x = 1,658,671.48/1,411.11
  6. Step 6: Final answer
    x = 1,175.44

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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.