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Finding the Fourth Proportional to 756.89, 1,135.37 and 392.39

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Solution

The fourth proportional to 756.89, 1,135.37 and 392.39 is: 588.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.89 : 1,135.37 = 392.39 : x
  2. Step 2: Convert to fraction form
    756.89/1,135.37 = 392.39/x
  3. Step 3: Cross multiply
    756.89x = 1,135.37 × 392.39
  4. Step 4: Simplify right side
    756.89x = 445,507.83
  5. Step 5: Solve for x
    x = 445,507.83/756.89
  6. Step 6: Final answer
    x = 588.60

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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.