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Finding the Fourth Proportional to 1,659.80, 2,291.88 and 1,129.80

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Solution

The fourth proportional to 1,659.80, 2,291.88 and 1,129.80 is: 1,560.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.80 : 2,291.88 = 1,129.80 : x
  2. Step 2: Convert to fraction form
    1,659.80/2,291.88 = 1,129.80/x
  3. Step 3: Cross multiply
    1,659.80x = 2,291.88 × 1,129.80
  4. Step 4: Simplify right side
    1,659.80x = 2,589,366.02
  5. Step 5: Solve for x
    x = 2,589,366.02/1,659.80
  6. Step 6: Final answer
    x = 1,560.05

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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.