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Finding the Fourth Proportional to 756.43, 1,134.63 and 208.61

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Solution

The fourth proportional to 756.43, 1,134.63 and 208.61 is: 312.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.43 : 1,134.63 = 208.61 : x
  2. Step 2: Convert to fraction form
    756.43/1,134.63 = 208.61/x
  3. Step 3: Cross multiply
    756.43x = 1,134.63 × 208.61
  4. Step 4: Simplify right side
    756.43x = 236,695.16
  5. Step 5: Solve for x
    x = 236,695.16/756.43
  6. Step 6: Final answer
    x = 312.91

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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.