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Finding the Fourth Proportional to 755.68, 1,132.30 and 431.28

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Solution

The fourth proportional to 755.68, 1,132.30 and 431.28 is: 646.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.68 : 1,132.30 = 431.28 : x
  2. Step 2: Convert to fraction form
    755.68/1,132.30 = 431.28/x
  3. Step 3: Cross multiply
    755.68x = 1,132.30 × 431.28
  4. Step 4: Simplify right side
    755.68x = 488,338.34
  5. Step 5: Solve for x
    x = 488,338.34/755.68
  6. Step 6: Final answer
    x = 646.22

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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.