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Finding the Fourth Proportional to 1,160.91, 1,600.20 and 911.84

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Solution

The fourth proportional to 1,160.91, 1,600.20 and 911.84 is: 1,256.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,160.91 : 1,600.20 = 911.84 : x
  2. Step 2: Convert to fraction form
    1,160.91/1,600.20 = 911.84/x
  3. Step 3: Cross multiply
    1,160.91x = 1,600.20 × 911.84
  4. Step 4: Simplify right side
    1,160.91x = 1,459,118.37
  5. Step 5: Solve for x
    x = 1,459,118.37/1,160.91
  6. Step 6: Final answer
    x = 1,256.87

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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.