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Finding the Fourth Proportional to 2,159.57, 3,238.88 and 772.90

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Solution

The fourth proportional to 2,159.57, 3,238.88 and 772.90 is: 1,159.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.57 : 3,238.88 = 772.90 : x
  2. Step 2: Convert to fraction form
    2,159.57/3,238.88 = 772.90/x
  3. Step 3: Cross multiply
    2,159.57x = 3,238.88 × 772.90
  4. Step 4: Simplify right side
    2,159.57x = 2,503,318.39
  5. Step 5: Solve for x
    x = 2,503,318.39/2,159.57
  6. Step 6: Final answer
    x = 1,159.17

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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.