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Finding the Fourth Proportional to 755.62, 1,135.52 and 660.40

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Solution

The fourth proportional to 755.62, 1,135.52 and 660.40 is: 992.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.62 : 1,135.52 = 660.40 : x
  2. Step 2: Convert to fraction form
    755.62/1,135.52 = 660.40/x
  3. Step 3: Cross multiply
    755.62x = 1,135.52 × 660.40
  4. Step 4: Simplify right side
    755.62x = 749,897.41
  5. Step 5: Solve for x
    x = 749,897.41/755.62
  6. Step 6: Final answer
    x = 992.43

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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.