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Finding the Fourth Proportional to 755.14, 1,042.21 and 423.70

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Solution

The fourth proportional to 755.14, 1,042.21 and 423.70 is: 584.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.14 : 1,042.21 = 423.70 : x
  2. Step 2: Convert to fraction form
    755.14/1,042.21 = 423.70/x
  3. Step 3: Cross multiply
    755.14x = 1,042.21 × 423.70
  4. Step 4: Simplify right side
    755.14x = 441,584.38
  5. Step 5: Solve for x
    x = 441,584.38/755.14
  6. Step 6: Final answer
    x = 584.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.