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Finding the Fourth Proportional to 1,046.60, 1,450.91 and 991.11

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Solution

The fourth proportional to 1,046.60, 1,450.91 and 991.11 is: 1,373.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,046.60 : 1,450.91 = 991.11 : x
  2. Step 2: Convert to fraction form
    1,046.60/1,450.91 = 991.11/x
  3. Step 3: Cross multiply
    1,046.60x = 1,450.91 × 991.11
  4. Step 4: Simplify right side
    1,046.60x = 1,438,006.45
  5. Step 5: Solve for x
    x = 1,438,006.45/1,046.60
  6. Step 6: Final answer
    x = 1,373.99

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.