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Finding the Fourth Proportional to 2,840.31, 4,260.44 and 991.43

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Solution

The fourth proportional to 2,840.31, 4,260.44 and 991.43 is: 1,487.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,840.31 : 4,260.44 = 991.43 : x
  2. Step 2: Convert to fraction form
    2,840.31/4,260.44 = 991.43/x
  3. Step 3: Cross multiply
    2,840.31x = 4,260.44 × 991.43
  4. Step 4: Simplify right side
    2,840.31x = 4,223,901.77
  5. Step 5: Solve for x
    x = 4,223,901.77/2,840.31
  6. Step 6: Final answer
    x = 1,487.13

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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.