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Finding the Fourth Proportional to 1,373.94, 2,060.91 and 991.62

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Solution

The fourth proportional to 1,373.94, 2,060.91 and 991.62 is: 1,487.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.94 : 2,060.91 = 991.62 : x
  2. Step 2: Convert to fraction form
    1,373.94/2,060.91 = 991.62/x
  3. Step 3: Cross multiply
    1,373.94x = 2,060.91 × 991.62
  4. Step 4: Simplify right side
    1,373.94x = 2,043,639.57
  5. Step 5: Solve for x
    x = 2,043,639.57/1,373.94
  6. Step 6: Final answer
    x = 1,487.43

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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.