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Finding the Fourth Proportional to 2,991.63, 4,487.62 and 939.63

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Solution

The fourth proportional to 2,991.63, 4,487.62 and 939.63 is: 1,409.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.63 : 4,487.62 = 939.63 : x
  2. Step 2: Convert to fraction form
    2,991.63/4,487.62 = 939.63/x
  3. Step 3: Cross multiply
    2,991.63x = 4,487.62 × 939.63
  4. Step 4: Simplify right side
    2,991.63x = 4,216,677.59
  5. Step 5: Solve for x
    x = 4,216,677.59/2,991.63
  6. Step 6: Final answer
    x = 1,409.49

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1.5x scale

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.