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Finding the Fourth Proportional to 1,579.53, 2,179.47 and 990.87

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Solution

The fourth proportional to 1,579.53, 2,179.47 and 990.87 is: 1,367.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.53 : 2,179.47 = 990.87 : x
  2. Step 2: Convert to fraction form
    1,579.53/2,179.47 = 990.87/x
  3. Step 3: Cross multiply
    1,579.53x = 2,179.47 × 990.87
  4. Step 4: Simplify right side
    1,579.53x = 2,159,571.44
  5. Step 5: Solve for x
    x = 2,159,571.44/1,579.53
  6. Step 6: Final answer
    x = 1,367.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.