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Finding the Fourth Proportional to 1,113.92, 1,670.91 and 854.39

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Solution

The fourth proportional to 1,113.92, 1,670.91 and 854.39 is: 1,281.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.92 : 1,670.91 = 854.39 : x
  2. Step 2: Convert to fraction form
    1,113.92/1,670.91 = 854.39/x
  3. Step 3: Cross multiply
    1,113.92x = 1,670.91 × 854.39
  4. Step 4: Simplify right side
    1,113.92x = 1,427,608.79
  5. Step 5: Solve for x
    x = 1,427,608.79/1,113.92
  6. Step 6: Final answer
    x = 1,281.61

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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.