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Finding the Fourth Proportional to 859.69, 1,289.51 and 210.43

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Solution

The fourth proportional to 859.69, 1,289.51 and 210.43 is: 315.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.69 : 1,289.51 = 210.43 : x
  2. Step 2: Convert to fraction form
    859.69/1,289.51 = 210.43/x
  3. Step 3: Cross multiply
    859.69x = 1,289.51 × 210.43
  4. Step 4: Simplify right side
    859.69x = 271,351.59
  5. Step 5: Solve for x
    x = 271,351.59/859.69
  6. Step 6: Final answer
    x = 315.64

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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.