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Finding the Fourth Proportional to 1,579.65, 2,179.84 and 990.51

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Solution

The fourth proportional to 1,579.65, 2,179.84 and 990.51 is: 1,366.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.65 : 2,179.84 = 990.51 : x
  2. Step 2: Convert to fraction form
    1,579.65/2,179.84 = 990.51/x
  3. Step 3: Cross multiply
    1,579.65x = 2,179.84 × 990.51
  4. Step 4: Simplify right side
    1,579.65x = 2,159,153.32
  5. Step 5: Solve for x
    x = 2,159,153.32/1,579.65
  6. Step 6: Final answer
    x = 1,366.86

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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.