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Finding the Fourth Proportional to 2,659.10, 3,987.80 and 879.83

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Solution

The fourth proportional to 2,659.10, 3,987.80 and 879.83 is: 1,319.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,659.10 : 3,987.80 = 879.83 : x
  2. Step 2: Convert to fraction form
    2,659.10/3,987.80 = 879.83/x
  3. Step 3: Cross multiply
    2,659.10x = 3,987.80 × 879.83
  4. Step 4: Simplify right side
    2,659.10x = 3,508,598.24
  5. Step 5: Solve for x
    x = 3,508,598.24/2,659.10
  6. Step 6: Final answer
    x = 1,319.47

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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.