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Finding the Fourth Proportional to 755.55, 1,133.31 and 390.44

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Solution

The fourth proportional to 755.55, 1,133.31 and 390.44 is: 585.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.55 : 1,133.31 = 390.44 : x
  2. Step 2: Convert to fraction form
    755.55/1,133.31 = 390.44/x
  3. Step 3: Cross multiply
    755.55x = 1,133.31 × 390.44
  4. Step 4: Simplify right side
    755.55x = 442,483.89
  5. Step 5: Solve for x
    x = 442,483.89/755.55
  6. Step 6: Final answer
    x = 585.64

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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.