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Finding the Fourth Proportional to 755.66, 1,134.09 and 390.55

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Solution

The fourth proportional to 755.66, 1,134.09 and 390.55 is: 586.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.66 : 1,134.09 = 390.55 : x
  2. Step 2: Convert to fraction form
    755.66/1,134.09 = 390.55/x
  3. Step 3: Cross multiply
    755.66x = 1,134.09 × 390.55
  4. Step 4: Simplify right side
    755.66x = 442,918.85
  5. Step 5: Solve for x
    x = 442,918.85/755.66
  6. Step 6: Final answer
    x = 586.14

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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.