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Finding the Fourth Proportional to 755.61, 1,042.71 and 440.88

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Solution

The fourth proportional to 755.61, 1,042.71 and 440.88 is: 608.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.61 : 1,042.71 = 440.88 : x
  2. Step 2: Convert to fraction form
    755.61/1,042.71 = 440.88/x
  3. Step 3: Cross multiply
    755.61x = 1,042.71 × 440.88
  4. Step 4: Simplify right side
    755.61x = 459,709.98
  5. Step 5: Solve for x
    x = 459,709.98/755.61
  6. Step 6: Final answer
    x = 608.40

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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.