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Finding the Fourth Proportional to 2,159.12, 3,239.04 and 860.64

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Solution

The fourth proportional to 2,159.12, 3,239.04 and 860.64 is: 1,291.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.12 : 3,239.04 = 860.64 : x
  2. Step 2: Convert to fraction form
    2,159.12/3,239.04 = 860.64/x
  3. Step 3: Cross multiply
    2,159.12x = 3,239.04 × 860.64
  4. Step 4: Simplify right side
    2,159.12x = 2,787,647.39
  5. Step 5: Solve for x
    x = 2,787,647.39/2,159.12
  6. Step 6: Final answer
    x = 1,291.10

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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.