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Finding the Fourth Proportional to 755.94, 1,134.60 and 390.96

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Solution

The fourth proportional to 755.94, 1,134.60 and 390.96 is: 586.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.94 : 1,134.60 = 390.96 : x
  2. Step 2: Convert to fraction form
    755.94/1,134.60 = 390.96/x
  3. Step 3: Cross multiply
    755.94x = 1,134.60 × 390.96
  4. Step 4: Simplify right side
    755.94x = 443,583.22
  5. Step 5: Solve for x
    x = 443,583.22/755.94
  6. Step 6: Final answer
    x = 586.80

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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.