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Finding the Fourth Proportional to 755.48, 1,132.20 and 389.50

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Solution

The fourth proportional to 755.48, 1,132.20 and 389.50 is: 583.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.48 : 1,132.20 = 389.50 : x
  2. Step 2: Convert to fraction form
    755.48/1,132.20 = 389.50/x
  3. Step 3: Cross multiply
    755.48x = 1,132.20 × 389.50
  4. Step 4: Simplify right side
    755.48x = 440,991.90
  5. Step 5: Solve for x
    x = 440,991.90/755.48
  6. Step 6: Final answer
    x = 583.72

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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.