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Finding the Fourth Proportional to 755.41, 1,133.72 and 390.30

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Solution

The fourth proportional to 755.41, 1,133.72 and 390.30 is: 585.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.41 : 1,133.72 = 390.30 : x
  2. Step 2: Convert to fraction form
    755.41/1,133.72 = 390.30/x
  3. Step 3: Cross multiply
    755.41x = 1,133.72 × 390.30
  4. Step 4: Simplify right side
    755.41x = 442,490.92
  5. Step 5: Solve for x
    x = 442,490.92/755.41
  6. Step 6: Final answer
    x = 585.76

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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.