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Finding the Fourth Proportional to 1,283.94, 1,923.36 and 991.14

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Solution

The fourth proportional to 1,283.94, 1,923.36 and 991.14 is: 1,484.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.94 : 1,923.36 = 991.14 : x
  2. Step 2: Convert to fraction form
    1,283.94/1,923.36 = 991.14/x
  3. Step 3: Cross multiply
    1,283.94x = 1,923.36 × 991.14
  4. Step 4: Simplify right side
    1,283.94x = 1,906,319.03
  5. Step 5: Solve for x
    x = 1,906,319.03/1,283.94
  6. Step 6: Final answer
    x = 1,484.74

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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.