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Finding the Fourth Proportional to 2,159.09, 3,238.63 and 860.25

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Solution

The fourth proportional to 2,159.09, 3,238.63 and 860.25 is: 1,290.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.09 : 3,238.63 = 860.25 : x
  2. Step 2: Convert to fraction form
    2,159.09/3,238.63 = 860.25/x
  3. Step 3: Cross multiply
    2,159.09x = 3,238.63 × 860.25
  4. Step 4: Simplify right side
    2,159.09x = 2,786,031.46
  5. Step 5: Solve for x
    x = 2,786,031.46/2,159.09
  6. Step 6: Final answer
    x = 1,290.37

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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.