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Finding the Fourth Proportional to 755.15, 1,042.08 and 423.59

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Solution

The fourth proportional to 755.15, 1,042.08 and 423.59 is: 584.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.15 : 1,042.08 = 423.59 : x
  2. Step 2: Convert to fraction form
    755.15/1,042.08 = 423.59/x
  3. Step 3: Cross multiply
    755.15x = 1,042.08 × 423.59
  4. Step 4: Simplify right side
    755.15x = 441,409.46
  5. Step 5: Solve for x
    x = 441,409.46/755.15
  6. Step 6: Final answer
    x = 584.54

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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.