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Finding the Fourth Proportional to 756.60, 1,135.26 and 432.08

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Solution

The fourth proportional to 756.60, 1,135.26 and 432.08 is: 648.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.60 : 1,135.26 = 432.08 : x
  2. Step 2: Convert to fraction form
    756.60/1,135.26 = 432.08/x
  3. Step 3: Cross multiply
    756.60x = 1,135.26 × 432.08
  4. Step 4: Simplify right side
    756.60x = 490,523.14
  5. Step 5: Solve for x
    x = 490,523.14/756.60
  6. Step 6: Final answer
    x = 648.33

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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.