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Finding the Fourth Proportional to 1,579.10, 2,180.54 and 990.65

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Solution

The fourth proportional to 1,579.10, 2,180.54 and 990.65 is: 1,367.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.10 : 2,180.54 = 990.65 : x
  2. Step 2: Convert to fraction form
    1,579.10/2,180.54 = 990.65/x
  3. Step 3: Cross multiply
    1,579.10x = 2,180.54 × 990.65
  4. Step 4: Simplify right side
    1,579.10x = 2,160,147.00
  5. Step 5: Solve for x
    x = 2,160,147.00/1,579.10
  6. Step 6: Final answer
    x = 1,367.96

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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.